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Tutors Answer Your Questions about Probability-and-statistics (FREE)
Question 143671: Sean tells perspective clients that the probability of rain at the dive location is .2 each day. Which expression can be used to calculate the probability that it will rain on exactly 5 days of the 7 days at the dive location?
Click here to see answer by edjones(3292)   |
Question 143705: there is a 30% chance of rain today or a 60% chance of rain tommorrow, what is the chance of rain today or tommorrow?
& there is a 30% chance of rain today and a 60% chance of rain tomorrow, what is the chance of rain today and tomorrow?
Thanks
Click here to see answer by rapaljer(3620)  |
Question 143704: You draw 2 cards from a well shuffled deck of 52 cards, after you draw the first card, you do not replace it in the deck.
what is the probability of drawing an ace of spades on your first draw is 1/52 what is the probability of
p(get a Q of hearts in teh 2nd draw/get ace of spades in the first)
and
you draw 2 cards from a well shuffled deck of 52 cards, after you draw the first card you replace it in the deck. what is the probability of drawing an ace of spades on your first draw is 1/52 what is the probability of
p(get a Q of hearts in the 2nd draw/ get ace of spades in the first)
Click here to see answer by rapaljer(3620) |
Question 143831This question is from textbook Mathematics All Around
: Can you help me with this problem?
I think i am on the right track but am not sure. Any help would be appreciated.
I am not sure on how to find the percentiles on problem # 80.
Suppose that the mean salary for your profession is $53,000 with a standard
deviation of $2,500. To what percentile does your salary of $57,000 correspond?
This is how i worked it out but i think i am missing a piece.
I took the mean which is $53,000 and subtracted $57,000 from it which
gave me a -$4000 and then divided it by the standard deviation which is
$2,500 which gave me -1.6. But now what do i do now to get the percent?
Any guidance you can provide would truly help. ThankyouThis question is from textbook Mathematics All Around
Click here to see answer by vleith(1977) |
Question 143834This question is from textbook Mathematics All Around
: Can you please tell me If I set this up and worked it out correctly.
Question:
Analyzing customer service. The distribution of times that customers spend waiting in line in a supermarket has a mean of 3.6 minutes and a standard deviation of 1.2 minutes. For this distribution find the raw score that corresponds to a z-score of -1.3.
Here is how I set it up
-1.3= x-3.6 divided by 1.2
Then i multiplied both sides by 1.2 giving me the equation of
-1.56 = X-3.6,
-1.56 +3.6 = X,
2.04 = X
X = 2.04
Raw score is 2.04 that corresponds to the z-score of -1.3.
Can you tell me if this is the correct way to work this out?
Thank You.
This question is from textbook Mathematics All Around
Click here to see answer by vleith(1977) |
Question 143676This question is from textbook Statistical Techniques in business and economics
: Problem 10-36. The Rutter Nursery Company packages their pine bark mulch in 50-pound bags. From a long history, the production department reports that the distribution of the bag weights follows the normal distribution and the standard deviation of this processis 3 pounds per bag. At the end of each day, Jeff Rutter, the production manager, weighs 10 bags and computes the mean weight of the sample. Below are the weights of 10 bags from today's production.
45.6 47.7 47.6 46.3 46.2 47.4 49.2 55.8 47.5 48.5
a. Can Mr. Rutter conclude that the mean weight of the bags is less than 50 pounds? Use the .01 significance level.
b. In a brief report, tell why Mr. Rutter can use the z distribution as the test statistic.
c. Compute the p-value.
This question is from textbook Statistical Techniques in business and economics
Click here to see answer by stanbon(26259) |
Question 143976: Consider a tree diagram representing all the possible final outcomes in the following scenario: You buy a fancy sports car with 7 choices of wheel covers, 4 choices of stereo model, 8 upholstery packages, and a choice of clear or tinted glass windows. How many "leaves" does the tree have?
Click here to see answer by vleith(1977) |
Question 143974: You have 7 friends who want to go to a concert with you, but you only have room in your car for 2 of them. To avoid accusations of favoritism, you have your friends draw straws: There are 3 long and 2 short straws, and the short straws win. How many possible pairs of friends could be chosen in this way?
Click here to see answer by stanbon(26259) |
Question 144045: A coin was flipped 60 times and came up heads 38 times. (a) At the .10 level of significance, is the
coin biased toward heads? Show your decision rule and calculations. (b) Calculate a p-value and
interpret it.
Click here to see answer by stanbon(26259) |
Question 144046:
The Web-based company Oh Baby! Gifts has a goal of processing 95 percent of its orders on the
same day they are received. If 485 out of the next 500 orders are processed on the same day, would
this prove that they are exceeding their goal, using α = .025? (See story.news.yahoo.com accessed
June 25, 2004.)
Click here to see answer by stanbon(26259) |
Question 144048:
An auditor reviewed 25 oral surgery insurance claims from a particular surgical office, determining
that the mean out-of-pocket patient billing above the reimbursed amount was $275.66 with a
standard deviation of $78.11. (a) At the 5 percent level of significance, does this sample prove a
violation of the guideline that the average patient should pay no more than $250 out-of-pocket?
State your hypotheses and decision rule. (b) Is this a close decision?
Click here to see answer by stanbon(26259) |
Question 144060: ok i have answered the question but i am lost on how to apply this to excel has anyone done this before or know how to use this?
At the .01 level of significance, is the true mean greater than 10?
Ho: mu = 10
Ha: mu > 10
t(14.44) = (14.44-10)/[4.45/sqrt(35)] = 4.44*sqrt (35)/4.45 = 5.9027
p-value = P (5.9027
the p-value is far less than alpha=1%, hasten to reject Ho.
The test gives strong statistical evidence the mean is not 10.
the mean is greater than 10; since that is the alternative hypothesis.
(b) Use Excel to find the right-tail p-value.
Click here to see answer by stanbon(26259) |
Question 144141: Girls ice skates colors: white, beige, pink, yellow, and blue
sizes: 4,5,6,7,8
extras: tassels, striped laces, and bells
Assuming that all skates are sold with one extra, how many possibe arrangements exist?
Click here to see answer by stanbon(26259) |
Question 144247: Can someone please help me with this problem?
The standard deviation for the data set {28,84,67,71,92,37,45,32,74,96}. Assume this is the entire data set, not a sampling of a larger population.
a. 62.5
b. 23.99
c. 25.29
d. 575.64
Please get back to me as soon as you can THANK YOU
Click here to see answer by scott8148(3382)  |
Question 144416: The manager of a software company is studying the number of hours/week that senior executives spend at their
destop computers. There are three industries that he has data for and these are listed under Banking, Retail, and Insurance.
The sample size is n = 5 senior managers from each of the industries and the times listed are shown in the table below.
ANOVA Problem:
At the 0.05 significance level, can the software manager doing the study conclude
that there is a difference in the mean number of hours spent per week by industry?
Banking Retail Insurance
12 8 10
10 8 8
10 6 6
12 8 8
10 10 10
Click here to see answer by stanbon(26259) |
Question 144487: Many college graduates who are employed full-time have longer than -hour work weeks. Suppose that we wish to estimate the mean number of hours, , worked per week by college graduates employed full-time. We'll choose a random sample of college graduates employed full-time and use the mean of this sample to estimate . Assuming that the standard deviation of the number of hours worked by college graduates is hours per week, what is the minimum sample size needed in order for us to be confident that our estimate is within hours per week of ?
Carry your intermediate computations to at least three decimal places. Write your answer as a whole number (and make sure that it is the minimum whole number that satisfies the requirements
Click here to see answer by stanbon(26259) |
Question 144489: Scrap Per Thousand Units
Plant A Plant B Plant C
11.4 11.1 10.2
12.5 14.1 9.5
10.1 16.8 9.0
13.8 13.2 13.3
13.7 14.6 5.9
1.State the null and alternate hypothesis. 2.What is the decision rule? 3.Compute SSA,SSE,and SST using Excel. 4.Complete a one-factor ANOVA table. 5.State the decision rule regardingthe null hypothesis. 6.Does the data prove significant difference in mean scrap rates?
Click here to see answer by stanbon(26259) |
Question 144536This question is from textbook
: When my children were young, they played Monopoly, which uses only one die. One day, Josh rolled a 2, then Emily rolled a 2, then I rolled a 2. What is the probability of rolling three 2s in a row on three tosses of a die?This question is from textbook
Click here to see answer by Alan3354(6059)  |
Question 144562This question is from textbook
: You & a friend are at Paul & Elizabeth's Restaurant for a night of fine dining. You can choose among 2 appetizers, 4main dishes, & 3 desserts.
Appetizer: soup or salad
Main Dish: fish, chicken, beef, vegetarian
Dessert: chocolate cake, apple pie, ice cream
a: How many possible different dinners are there?
b: If there are 3 choices of salad dressing & 4 choices of ice cream, how many possible dinner combinations are there? This question is from textbook
Click here to see answer by checkley77(7035) |
Question 144554This question is from textbook
: Make 2 six-sided dice so that only even sums are possible and each sum is equally likely. Your solution must be other than the trivial solution of "the same odd number on all 12 faces."This question is from textbook
Click here to see answer by Alan3354(6059) |
Question 144558This question is from textbook
: Lets say that a family of 5 decides that instead of each person buying a present for each other person in the family, all the family members will put their names in a hat. Each person then takes one name out of the hat & buys a present for that person. What is the probability of every family member getting his or her own name?
This question is from textbook
Click here to see answer by stanbon(26259) |
Question 144614: A bag contains 5 apples and 3 oranges. If you select 4 pieces of fruit without looking, how many ways can you get exactly 3 apples?
A) 60 ways B) 180 ways
C) 20 ways D) 30 ways
can you please explain!
Click here to see answer by shahid(44) |
Question 144616: An order of award presentations has been devised for seven people: Jeff, Karen, Lyle,Maria, Norm, Olivia, and Paul.In how many ways can the awards be presented so that Maria and Olivia will be next to each other?
A) 1220 B) 1680
C) 720 D) 1440
Please explain!
Click here to see answer by stanbon(26259) |
Question 144654: In a learning task, a subject is presented with five buttons. He must learn to press a certain three of them in a predetermined order. What chance does the subject have of pressing correctly on the first time.
Click here to see answer by edjones(3292) |
Question 144561This question is from textbook
: This unfortunate event happened to me when my two children were little. Each of them had a friend over for lunch. After lunch, we had popsicles for dessert. There were 9 popsicles in the freezer & 3 flavors: 3 grape, 3 cherry, & 3 orange. What is the probability that each child will get the popsicle that child wants.This question is from textbook
Click here to see answer by edjones(3292) |
Question 144757: tiles with 26 letters on them in a box. If 3 tiles are drawn from the box, with replacement. what is the probability that the tiles selected will spell the word sum? The letters must be selected in the correct order.
Click here to see answer by stanbon(26259) |
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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
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