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Question 1010914: It is estimated that 89% of senior citizens suffer from sleep disorders and 9% suffer from anxiety. Moreover, 6% of senior citizens suffer from both sleep disorders and anxiety.

(a) Find the probability that a senior citizen suffers from anxiety, given that he or she has sleep disorder. Round your answer to decimal places.
(b) Given that a senior citizen suffers from anxiety, what is the probability that he or she also suffers from sleep disorder? Round your answer to decimal places.

Click here to see answer by stanbon(75887)

Question 1010507: a company that produces conputers sold 2000 computers in the last 10 years,the company wanted to know the lifetime of computers it produces,.it selected 600 clients at random and recorded the lifetime.determine the population the sample,the variable of interest and decide whether this variable is continuous or discrete data?
Click here to see answer by Theo(13342)

Question 1011005: what is the area between the z values of 1.45 and 2.45?

Click here to see answer by mathmate(429)

Question 1011009: a box contain 50 light bulbs, of which 4 are detective. you purchase two bulbs from this box. what is the probability that both will be defective?
Click here to see answer by mathmate(429)

Question 1011016: the probability that a double glazing salesperson will make a sale on a particular day is 0.05. what is the probability that over a three day period the sale person will make: 3 sales, exactly 1 sale, at least 1 sale?
Click here to see answer by mathmate(429)

Question 1011025: A classroom of 30 students are all measured by height. The heights are as follows: 5.4, 5.5, 6.2, 5.11, 5.2, 5.4, 5.3, 5.9, 5.3, 5.1, 5.10, 5.11, 6.1, 5.6, 5.8, 5.7, 6.0, 4.11, 5.3, 5.7, 6.3, 5.11, 5.2, 5.4, 5.7, 5.3, 5.5, 5.9, 5.6, and 5.10.
The question is:
Describe your survey process. What are some sources of possible bias in
your sample? Alternatively, what did you do to ensure a random sample?
I have no idea how to answer this. Please help!!!
Click here to see answer by stanbon(75887)

Question 1011020: 3. Find the margin of error to the nearest whole tenth of percent for a survey with the indicated population size.
A. 375

B. 3200

Click here to see answer by stanbon(75887)

Question 1011056: Joseph and Mikky are both studying for an exam. They feel that Joseph has a 55% chance of getting an A, and Mikky has a 35% chance. Suppose that there is a 15% chance that BOTH get an A. What is the chance that at least ONE of them will get an A?
Click here to see answer by Theo(13342)

Question 1011024: A classroom of 30 students are all measured by height. The heights are as follows: 5.4, 5.5, 6.2, 5.11, 5.2, 5.4, 5.3, 5.9, 5.3, 5.1, 5.10, 5.11, 6.1, 5.6, 5.8, 5.7, 6.0, 4.11, 5.3, 5.7, 6.3, 5.11, 5.2, 5.4, 5.7, 5.3, 5.5, 5.9, 5.6, and 5.10.
Does the data follow a normal distribution?
a. If your sample follows a normal distribution, does this makes sense to
you? Explain why.
b. If your sample does not follow a normal distribution (e.g., it could be
skewed left or right, have a uniform distribution, or have some other
shape), then why might this be the reason?
I had to make this data set up. Please help!

Click here to see answer by rothauserc(4718)

Question 1011068: you have 10000$ available for investment in stock. you are looking for a growth stock that can grow your investment to $35000 over five years. the growth rate are
Click here to see answer by stanbon(75887)

Question 1011066: a coin is tossed three times, what is the probability of two heads
Click here to see answer by stanbon(75887)

Question 1011091: how many ways can seven different
types of soaps be displayed on s shelf in a
grocery store?
Click here to see answer by stanbon(75887)

Question 1011065: In one year, three research awards will be given to a class of 20 students. If each student can receive at most one award. What are the numbers of possible sellection
Click here to see answer by stanbon(75887)

Question 1011019: 4. Find the sample size required to achieve the given margin of error. 87% of the respondents agreed to lowering the income tax bracket.
A. � 4.5%

B. �0.6%

Click here to see answer by stanbon(75887)

Question 1011100: 6) Find the z-score for which99% of the distribution's area lies between -z and z. 6) A) (-1.96,1.96) B) (-1.645,1.645) C) (-1.28,1.28) D) (-2.575,2.575)
Click here to see answer by stanbon(75887)

Question 1011103: The weights of bags of ready-to-eat salad are normally distributed with a mean of 290 grams and a standard deviation of 10 grams. What percent of the bags weigh less than 280 grams?
Click here to see answer by stanbon(75887)

Question 1011167: a distribution center receives shipments of a product from 3 different factories in the quantities of 50, 30, and 20. three times a product is selected at random, each time without replacement. find the probability that (a) all 3 products came from the third factory and (b) non of the products came from the third factory.

Click here to see answer by MathTherapy(10549)

Question 1011182: On tossing a die and getting #1 if you gain RS 100, gain RS 200 in getting #2 ,and so on What is the EXPECTED total gain if you throw the die 100 times?
Click here to see answer by Edwin McCravy(20054)

Question 1011155: Twelve people show up to help out at a concession stand. Two people are needed to remain with the cash box, four people are needed to make the food, and the rest would work with the customers. In how many different ways can these jobs be assigned?

Click here to see answer by KMST(5328)

Question 1011231: Find the mean, variance, and standard deviation of the probability distribution,
Complete parts (a) and (b) using the probability distribution below.
The number of overtime hours worked in one week per employee overtime hours.
0 1 2 3 4 5 6
Probability 0.032 0.058 0.169 0.296 0.228 0.143 0.074
Click here to see answer by Boreal(15235)

Question 1011230: 38% of adults say cashews are their favorite kind of nut. You randomly select 12 adults and ask each to name his or her favorite nut. Find the probability that the number who say cashews are their favorite nut is (a) exactly three, (b) at least four, and (c) at most two. If convenient, use technology to find the possibilities.
Click here to see answer by Boreal(15235)

Question 1011190: To estimate the average time it takes to assemble a certain
computer component the industrial engineer at an
electronics firm timed 49 technicians in the performance
of this task, getting a mean of 12.00 minutes and a
standard deviation of 1.90 minute.
(i) What can we say with 95% confidence about the
maximum error if X = 12.00 is used as a point
estimate of the actual average time required to do
the job?
(ii) Use the given data to construct a 99% confidence
interval for the true average time it takes to
assemble the computer components
Click here to see answer by Boreal(15235)

Question 1011189: In a labour management discussion it was brought up that
workers at a certain large plant take on average 32.6
minutes to get to work. If a random sample of 60 workers
took on the average 33.8 minutes with a standard deviation
of 6.1 minutes, can we reject the null hypothesis � 6.1/sqrt(60= 32.6 in
a favor of the alternative hypothesis � > 32.6 at the 0.05
level of significance?
Click here to see answer by Boreal(15235)

Question 1011188: Q)J.J. Thomson (1856 - 1940) discovered the electron by
negatively charged particles for which he could
measure the mass - change ratio. The ratio appeared to
be constant over a wide range of experimental
conditions and consequently could be characteristics of
a new particle. His observations from two cathode ray
tubes that used air as the gas are
Tube 1 0.57 0.34 0.43 0.32 0.48 0.40 0.40
Tube 2 0.53 0.47 0.47 0.51 0.63 0.61 0.48
(i) Draw dot diagram with solid dots for Tube 1
observations and circles for Tube 2 observations.
(ii) Calculate the mean and standard deviation for the
Tube 1 observations.
(iii) Calculate the mean and standard deviation for the
Tube 2 observations
Click here to see answer by Boreal(15235)

Question 1011236: There are 25 pieces of candy in a box, 7 of them are rotten.what is the probability of randomly selecting a piece of candy that is safe to eat?
Click here to see answer by Alan3354(69443)

Question 1010455: The life expectancy of a typical lightbulb is normally distributed with a mean of 1,975 hours and a standard deviation of 25 hours. What is the probability that a lightbulb will last between 1,950 and 2,050 hours?

0.84
0.77
0.82
0.89
Please show how you got the answer so I can learn please.

Click here to see answer by stanbon(75887)

Question 1011187: A shipment of 120 burglar alarms contains 5 that are
defective. If 3 of the alarms are randomly selected and
shipped to a customer, find the probability that the
customer will get one bad unit by using
(i) The formula for the hyper geometric distribution
(ii) The formula for the binomial distribution as an
approximate
Click here to see answer by mathmate(429)

Question 1011283: Tyra averages 40 mi/her driving to the airport during rush hour and 60mi/he on the return trip late at night. What is Tyra's average speed for the entire trip?
Click here to see answer by josmiceli(19441)

Question 1011301: A civil engineer monitors water quality by measuring the
amount of suspended solids in a sample of river water
over 11 weeks the following observations were
recorded 14,12,21,28, 30, 63,29, 63, 55, 19, 20
Suspended solids (parts per million)
(i) Find the quartiles
(ii) Find the minimum, maximum, range and inter quartile
range,
(iii) Construct a box plot
Click here to see answer by mathmate(429)

Question 1011356: A student takes a 4-question, multiple-choice quiz with 3 choices for each question. If the student guesses on each question, what is probability that student guesses exactly 1 question correct?
Click here to see answer by mathmate(429)

Question 1009281: In a certain town, 75% of households own a cell phone, 45% own a laptop and 40% ownboth. A) draw a venn diagram for this problem.
B) determine the probability that a randomly selected person owns a laptop or a cell phone. ( Please show all work )
Click here to see answer by Edwin McCravy(20054)

Question 1011279: A civil engineer monitors water quality by measuring the
amount of suspended solids in a sample of river water
over 11 weeks the following observations were
recorded 14,12,21,28, 30, 63,29, 63, 55, 19, 20
Suspended solids (parts per million)
(i) Find the quartiles
(ii) Find the minimum, maximum, range and inter quartile
range,
(iii) Construct a box plot
Click here to see answer by mathmate(429)

Question 1011269: A civil engineer monitors water quality by measuring the
amount of suspended solids in a sample of river water
over 11 weeks the following observations were
recorded 14,12,21,28, 30, 63,29, 63, 55, 19, 20
Suspended solids (parts per million)
(i) Find the quartiles
(ii) Find the minimum, maximum, range and inter quartile
range,
(iii) Construct a box plot
Click here to see answer by mathmate(429)

Question 1011303: The following are the scores of 15 students obtained in
the midterm and final examinations in a course in
probability and statistics
Midterm
Exam, x 70 50 80 75 90 85 60 80 65 30 85 80 70 65 40
Final
Exam, y 85 60 75 80 90 75 50 75 75 50 75 90 65 55 60
(i) Find the equation of the least square line to fit these
data,
(ii) Estimate the final examination scores of a student
who received a score of 74 in the midterm
examination.
Click here to see answer by Boreal(15235)

Question 1011300: Explain why the following will not lead to random
samples from the desired populations.
(i) To determine what the average person spends on
a vacation, a market researcher interviews
passenger on a luxury cruise.
(ii) To determine public sentiment about certain import
restrictions an interviewer asks voters "Do you feel
that this unfair practice should be stopped?
Click here to see answer by Boreal(15235)

Question 1011121: Assume a simple random sample has been taken, the population standard deviation is known, and the population is normally distributed. According to a sample of 200 various insurance brokers and health experts, a typical childbirth in the United States costs a mean of $9500. Assume we know from a previous study, the standard deviation of the cost of the births is $2500. Use a 98% confidence level.
Click here to see answer by macston(5194)

Question 1011023: A classroom of 30 students are all measured by height. The heights are as follows: 5.4, 5.5, 6.2, 5.11, 5.2, 5.4, 5.3, 5.9, 5.3, 5.1, 5.10, 5.11, 6.1, 5.6, 5.8, 5.7, 6.0, 4.11, 5.3, 5.7, 6.3, 5.11, 5.2, 5.4, 5.7, 5.3, 5.5, 5.9, 5.6, and 5.10.
What is the Standard Deviation of the data? Does the data follow a normal distribution?
Thank you!!
Click here to see answer by macston(5194)

Question 1011406: 1. Express the confidence interval (0.064,0.148) in the form of
^p-E Hi I am having trouble with these questions and I need help please. I do not understand statistics at all. PLEASE HELP!!!!!
Click here to see answer by rothauserc(4718)

Question 1011423: A card is drawn from a standard deck of cards, find the probability of drawing a face card or a black card.
Click here to see answer by Alan3354(69443)

Question 1011453: Please help, I very much understand it is the holidays but I have to get this in and I cannot figure this out please
A data set includes 105 body temperatures of healthy adult humans for which (line over top of x)x=98.7 degrees F and s=0.64 degrees F.
Complete parts (a) and (b) below. SHOW WORK
a) What is the best point estimate of the mean body temperature of all healthy humans?
The best point estimate is______ degrees F(Type an interger or a decmial)
b)Using the sample statistics, construct a 99% confidence interval estimate of the mean body temperature of all healthy humans. Do the confidence interval limits contains 98.6 degrees F? What does the sample sugesst about the use of 98.6 degrees F as the mean body temperature?
What is the confidence interval estimate of the population mean u?
_______ Do the confidence interval limits contain 98.6 degrees F? No or Yes
What does this suggest about the use of 98.6 degrees F as the mean body Temperature?
A) This suggests that the mean body temperature could very possibly be 98.6 degrees F.
B) This suggest that the mean body temperature could be lower then 98.6 degrees F
C)This suggest that the mean body temperature could be higher then 98.6 degrees F
PLEASE HELP ME!!! I AS SO LOST AND DO NOT KNOW WHERE TO BEGIN PLEASE.
Click here to see answer by Boreal(15235)

Older solutions: 1..45, 46..90, 91..135, 136..180, 181..225, 226..270, 271..315, 316..360, 361..405, 406..450, 451..495, 496..540, 541..585, 586..630, 631..675, 676..720, 721..765, 766..810, 811..855, 856..900, 901..945, 946..990, 991..1035, 1036..1080, 1081..1125, 1126..1170, 1171..1215, 1216..1260, 1261..1305, 1306..1350, 1351..1395, 1396..1440, 1441..1485, 1486..1530, 1531..1575, 1576..1620, 1621..1665, 1666..1710, 1711..1755, 1756..1800, 1801..1845, 1846..1890, 1891..1935, 1936..1980, 1981..2025, 2026..2070, 2071..2115, 2116..2160, 2161..2205, 2206..2250, 2251..2295, 2296..2340, 2341..2385, 2386..2430, 2431..2475, 2476..2520, 2521..2565, 2566..2610, 2611..2655, 2656..2700, 2701..2745, 2746..2790, 2791..2835, 2836..2880, 2881..2925, 2926..2970, 2971..3015, 3016..3060, 3061..3105, 3106..3150, 3151..3195, 3196..3240, 3241..3285, 3286..3330, 3331..3375, 3376..3420, 3421..3465, 3466..3510, 3511..3555, 3556..3600, 3601..3645, 3646..3690, 3691..3735, 3736..3780, 3781..3825, 3826..3870, 3871..3915, 3916..3960, 3961..4005, 4006..4050, 4051..4095, 4096..4140, 4141..4185, 4186..4230, 4231..4275, 4276..4320, 4321..4365, 4366..4410, 4411..4455, 4456..4500, 4501..4545, 4546..4590, 4591..4635, 4636..4680, 4681..4725, 4726..4770, 4771..4815, 4816..4860, 4861..4905, 4906..4950, 4951..4995, 4996..5040, 5041..5085, 5086..5130, 5131..5175, 5176..5220, 5221..5265, 5266..5310, 5311..5355, 5356..5400, 5401..5445, 5446..5490, 5491..5535, 5536..5580, 5581..5625, 5626..5670, 5671..5715, 5716..5760, 5761..5805, 5806..5850, 5851..5895, 5896..5940, 5941..5985, 5986..6030, 6031..6075, 6076..6120, 6121..6165, 6166..6210, 6211..6255, 6256..6300, 6301..6345, 6346..6390, 6391..6435, 6436..6480, 6481..6525, 6526..6570, 6571..6615, 6616..6660, 6661..6705, 6706..6750, 6751..6795, 6796..6840, 6841..6885, 6886..6930, 6931..6975, 6976..7020, 7021..7065, 7066..7110, 7111..7155, 7156..7200, 7201..7245, 7246..7290, 7291..7335, 7336..7380, 7381..7425, 7426..7470, 7471..7515, 7516..7560, 7561..7605, 7606..7650, 7651..7695, 7696..7740, 7741..7785, 7786..7830, 7831..7875, 7876..7920, 7921..7965, 7966..8010, 8011..8055, 8056..8100, 8101..8145, 8146..8190, 8191..8235, 8236..8280, 8281..8325, 8326..8370, 8371..8415, 8416..8460, 8461..8505, 8506..8550, 8551..8595, 8596..8640, 8641..8685, 8686..8730, 8731..8775, 8776..8820, 8821..8865, 8866..8910, 8911..8955, 8956..9000, 9001..9045, 9046..9090, 9091..9135, 9136..9180, 9181..9225, 9226..9270, 9271..9315, 9316..9360, 9361..9405, 9406..9450, 9451..9495, 9496..9540, 9541..9585, 9586..9630, 9631..9675, 9676..9720, 9721..9765, 9766..9810, 9811..9855, 9856..9900, 9901..9945, 9946..9990, 9991..10035, 10036..10080, 10081..10125, 10126..10170, 10171..10215, 10216..10260, 10261..10305, 10306..10350, 10351..10395, 10396..10440, 10441..10485, 10486..10530, 10531..10575, 10576..10620, 10621..10665, 10666..10710, 10711..10755, 10756..10800, 10801..10845, 10846..10890, 10891..10935, 10936..10980, 10981..11025, 11026..11070, 11071..11115, 11116..11160, 11161..11205, 11206..11250, 11251..11295, 11296..11340, 11341..11385, 11386..11430, 11431..11475, 11476..11520, 11521..11565, 11566..11610, 11611..11655, 11656..11700, 11701..11745, 11746..11790, 11791..11835, 11836..11880, 11881..11925, 11926..11970, 11971..12015, 12016..12060, 12061..12105, 12106..12150, 12151..12195, 12196..12240, 12241..12285, 12286..12330, 12331..12375, 12376..12420, 12421..12465, 12466..12510, 12511..12555, 12556..12600, 12601..12645, 12646..12690, 12691..12735, 12736..12780, 12781..12825, 12826..12870, 12871..12915, 12916..12960, 12961..13005, 13006..13050, 13051..13095, 13096..13140, 13141..13185, 13186..13230, 13231..13275, 13276..13320, 13321..13365, 13366..13410, 13411..13455, 13456..13500, 13501..13545, 13546..13590, 13591..13635, 13636..13680, 13681..13725, 13726..13770, 13771..13815, 13816..13860, 13861..13905, 13906..13950, 13951..13995, 13996..14040, 14041..14085, 14086..14130, 14131..14175, 14176..14220, 14221..14265, 14266..14310, 14311..14355, 14356..14400, 14401..14445, 14446..14490, 14491..14535, 14536..14580, 14581..14625, 14626..14670, 14671..14715, 14716..14760, 14761..14805, 14806..14850, 14851..14895, 14896..14940, 14941..14985, 14986..15030, 15031..15075, 15076..15120, 15121..15165, 15166..15210, 15211..15255, 15256..15300, 15301..15345, 15346..15390, 15391..15435, 15436..15480, 15481..15525, 15526..15570, 15571..15615, 15616..15660, 15661..15705, 15706..15750, 15751..15795, 15796..15840, 15841..15885, 15886..15930, 15931..15975, 15976..16020, 16021..16065, 16066..16110, 16111..16155, 16156..16200, 16201..16245, 16246..16290, 16291..16335, 16336..16380, 16381..16425, 16426..16470, 16471..16515, 16516..16560, 16561..16605, 16606..16650, 16651..16695, 16696..16740, 16741..16785, 16786..16830, 16831..16875, 16876..16920, 16921..16965, 16966..17010, 17011..17055, 17056..17100, 17101..17145, 17146..17190, 17191..17235, 17236..17280, 17281..17325, 17326..17370, 17371..17415, 17416..17460, 17461..17505, 17506..17550, 17551..17595, 17596..17640, 17641..17685, 17686..17730, 17731..17775, 17776..17820, 17821..17865, 17866..17910, 17911..17955, 17956..18000, 18001..18045, 18046..18090, 18091..18135, 18136..18180, 18181..18225, 18226..18270, 18271..18315, 18316..18360, 18361..18405, 18406..18450, 18451..18495, 18496..18540, 18541..18585, 18586..18630, 18631..18675, 18676..18720, 18721..18765, 18766..18810, 18811..18855, 18856..18900, 18901..18945, 18946..18990, 18991..19035, 19036..19080, 19081..19125, 19126..19170, 19171..19215, 19216..19260, 19261..19305, 19306..19350, 19351..19395, 19396..19440, 19441..19485, 19486..19530, 19531..19575, 19576..19620, 19621..19665, 19666..19710, 19711..19755, 19756..19800, 19801..19845, 19846..19890, 19891..19935, 19936..19980, 19981..20025, 20026..20070, 20071..20115, 20116..20160, 20161..20205, 20206..20250, 20251..20295, 20296..20340, 20341..20385, 20386..20430, 20431..20475, 20476..20520, 20521..20565, 20566..20610, 20611..20655, 20656..20700, 20701..20745, 20746..20790, 20791..20835, 20836..20880, 20881..20925, 20926..20970, 20971..21015, 21016..21060, 21061..21105, 21106..21150, 21151..21195, 21196..21240, 21241..21285, 21286..21330, 21331..21375, 21376..21420, 21421..21465, 21466..21510, 21511..21555, 21556..21600, 21601..21645, 21646..21690, 21691..21735, 21736..21780, 21781..21825, 21826..21870, 21871..21915, 21916..21960, 21961..22005, 22006..22050, 22051..22095, 22096..22140, 22141..22185, 22186..22230, 22231..22275, 22276..22320, 22321..22365, 22366..22410, 22411..22455, 22456..22500, 22501..22545, 22546..22590, 22591..22635, 22636..22680, 22681..22725, 22726..22770, 22771..22815, 22816..22860, 22861..22905, 22906..22950, 22951..22995, 22996..23040, 23041..23085, 23086..23130, 23131..23175, 23176..23220, 23221..23265, 23266..23310, 23311..23355, 23356..23400, 23401..23445, 23446..23490, 23491..23535, 23536..23580, 23581..23625, 23626..23670, 23671..23715, 23716..23760, 23761..23805, 23806..23850, 23851..23895, 23896..23940, 23941..23985, 23986..24030, 24031..24075, 24076..24120, 24121..24165, 24166..24210, 24211..24255, 24256..24300, 24301..24345, 24346..24390, 24391..24435, 24436..24480, 24481..24525, 24526..24570, 24571..24615, 24616..24660, 24661..24705, 24706..24750, 24751..24795, 24796..24840, 24841..24885, 24886..24930, 24931..24975, 24976..25020, 25021..25065, 25066..25110, 25111..25155, 25156..25200, 25201..25245, 25246..25290, 25291..25335, 25336..25380, 25381..25425, 25426..25470, 25471..25515, 25516..25560, 25561..25605, 25606..25650, 25651..25695, 25696..25740, 25741..25785, 25786..25830, 25831..25875, 25876..25920, 25921..25965, 25966..26010, 26011..26055, 26056..26100, 26101..26145, 26146..26190, 26191..26235, 26236..26280, 26281..26325, 26326..26370, 26371..26415, 26416..26460, 26461..26505, 26506..26550, 26551..26595, 26596..26640, 26641..26685, 26686..26730, 26731..26775, 26776..26820, 26821..26865, 26866..26910, 26911..26955, 26956..27000, 27001..27045, 27046..27090, 27091..27135, 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