# Questions on Algebra: Probability and statistics answered by real tutors!

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 Algebra: Probability and statistics Solvers Lessons Answers archive Quiz In Depth

 Question 543763: A political discussion group consists of 5 Democrats, 6 Republicans, and 4 Independents. Suppose that 2 group members are selected randomly, in succession, to attend a political convention. Find the probability of selecting: No Independents. Click here to see answer by stanbon(57303)

 Question 543761: 45% paid in 10 days, random sample of 16 checked what is the probability of less that 3 in 10 days Click here to see answer by stanbon(57303)

 Question 543733: The main trial is conducted and involves a total of 200 patients. Patients have been enrolled and assigned randomly to receive either the experimental medication or the placebo. The data collected at the end of the study after six weeks on the assigned treatment. How do i find the 95% Confidence interval? Click here to see answer by stanbon(57303)

 Question 543690: Can someone explain each step involved in figuring compound interest quarterly? I understand what each letter stands for and can plug the numbers into the formula. My problem comes when you get to the nt exponent. I do not understand that part of the problem. For example: If you have \$1500 earning 4.3% interest compounded quarterly, how much money will be there in 7 years? Click here to see answer by stanbon(57303)

 Question 543678: Assignment 2: ANOVA Summary Table A psychologist believes that the kind of feedback a person receives about their work affects the quality of the work. You randomly assign 12 widget makers to one of three groups: positive feedback only, corrective feedback only, and no feedback. You track the number of widgets that each person makes correctly (out of 10) and obtain the following data: Positive Feedback Only, Corrective Feedback Only, No Feedback 5 4 5 4 5 4 4 3 6 7 6 2 Use an analysis of variance (α = 0.05) to determine whether this data is sufficient to conclude that there are significant differences between feedback conditions. Make sure you include a complete ANOVA summary table. Also, report the appropriate null and research hypotheses and the critical value (alpha = 0.05). In addition, provide your statistical conclusion, including calculation of test statistic, in the APA format and conceptual conclusion in one to two sentences. Click here to see answer by stanbon(57303)

 Question 302763: The average cost of tuition, room and board at small private liberal arts colleges is reported to be \$8,500 per term, but a financial administrator believes that the average cost is higher. A study conducted using 350 small liberal arts colleges showed that the average cost per term is \$8,745 with a standard deviation of \$1,200. Let = 0.05. Click here to see answer by dptdavis(1)

 Question 544393: write the decimal equivalent for 2/3 dollar and for 3/8 dollar show how you would express each amout using penny, nickle, dime, and quarters round the nearest penny Click here to see answer by rfer(12657)

 Question 544557: How far a guy is accurate if he gave 2 answers right out of 10??I want detailed explanation...any formulae?? Click here to see answer by nyc_function(2733)

 Question 544559: Sir,i ll give you the scenario,One question,4 options...he can click any options until the answer turns to true...ie it can be FFFT or FFTT etc....I want to know how accurate he is in solving this problem....please help me... Click here to see answer by sudhanshu_kmr(1152)

 Question 544597: If you are not prepaired for a test and you have 3 true or false questions what is the probablity of getting 2 out of the 3 correct? Click here to see answer by stanbon(57303)

 Question 544100: 1.How many bit strings of length 6 have: (a) Exactly three 0s? (b) The same number of 0s as 1s? (d) At least three 1s? 2.What is the probability that a positive integer m in the range 1= m= 100, which is selected randomly, is divisible by 4? . Click here to see answer by stanbon(57303)

 Question 544813: I am having trouble just understanding the standard normal distribution table, can you please show me how to use it.I really don't want you to work it I really need to know the correct way of finding it myself. Click here to see answer by stanbon(57303)

 Question 544849: find the probability P(E or F) if E and F are mutually exclusive, P(E) = 0.34 and P(F) = 0.45 Click here to see answer by rapaljer(4667)

 Question 544802: If the observed value is 9, the expected value is 11, and the standard error is 4, then the test value used for the z test is equal to Click here to see answer by stanbon(57303)

 Question 544791: suppose that 26% 0f the population believes that the minimum drinking are should be lowered. suppose we randomly select 5 individual from the population. referring to drinking Age find the probability that exactly 2 of the five individuals think the drinking age should be lowered. Click here to see answer by stanbon(57303)

 Question 544786: Suppose you are testing the hypotheses: H0: p1 = p2 Ha: p1 < p2 And X1 = 20 successes, n1 = 45, x2 = 15 successes, n2 = 40 a. Calculate the z-score b. State the formula used to estimate the p-value: p = Click here to see answer by stanbon(57303)

 Question 544748: How many different ways can five students sit in five chairs in a row if Mark and Ophelia refuse to sit next to each other? Click here to see answer by stanbon(57303)

 Question 544705: An access code for a security system consists of a letter followed by four digits. The letter can be any letter in the alphabet. The first digit cannont be a zero and last digit must be even. What is the total number of possible access codes? What is the probability of not selecting the correct access code on the first guess? Click here to see answer by stanbon(57303)

 Question 290773: A sample of people is selected. The people sampled are classified according to their place of residence and the highest educational degree that they have earned. The results are given in the contingency table below. Highest degree earned No college degree Two-year degree Four-year degree Advanced degree Urban 22 29 17 39 Suburban 24 35 29 33 Rural 15 16 47 17 What is the relative frequency of people in the sample whose place of residence is rural? Round your answer to at least two decimals places. Click here to see answer by jmugnano(1)

 Question 545093: Essay; show all work. A community 5K run will award \$50 to the winner. 75 people enter the race, and they each pay an entry fee of \$20. Assuming they are all equally likely to win, what is a fair price for the competition? Round to the nearest cent. Click here to see answer by stanbon(57303)

 Question 545072: The average hourly wage of employees in a large nationwide industry is \$12.96. Assume the variable is normally distributed, with a standard deviation of \$4.46. In a randomly selected sample of 10,000 such employees, how many of them (correct to the nearest hundred) would you expect to be earning between \$9.00 and \$17.00 per hour? Click here to see answer by stanbon(57303)

 Question 545197: A survey report states that 70% of adult women visit their doctors for a physical examination at least once in two years. If 20 adult women are randomly selected, find the probability that fewer than 14 of them have had a physical examination in the past two years. Click here to see answer by Edwin McCravy(8906)

 Question 545383: I can't figure out how to get the p-value. Question: 400 people are asked a question in a poll and 80 said yes. What is the P-value? I will be grateful for help, thank you. Click here to see answer by stanbon(57303)

 Question 545371: how many weeks of data must be randomly sampled to estimate the mean weekly sales of a new line of athetic footwear? We want 99% confidence that the sample means is within \$200 of the population , and the population standard devation is known to be \$1100 Click here to see answer by stanbon(57303)

 Question 545422: One half of all U.S. households pay bills electronically. If seven U.S. households are randomly selected, what is the probability that exactly two pay bills electronically? Click here to see answer by stanbon(57303)

 Question 545413: A class of first graders includes 7 girls and 14 boys, 2 students are selected at random to be the teachers assistant on a given day. What is the probability that both are boys? Click here to see answer by stanbon(57303)

 Question 545807: evaluate the expression. ₆ P ₀ I am not sure how to do this problem it has 8 p 0 I have read the chapters but still am confused on this can anyone help me understand this Click here to see answer by neatmath(300)

 Question 545766: Find the probability. A lottery game has balls numbered 1 through 21. What is the probability that a randomly selected ball is an even numbered ball or a 12? Click here to see answer by neatmath(300)

 Question 545817: A nationwide survey of 17,000 college seniors by the University of Michigan revealed that almost 70% disapprove of daily pot smoking. If 18 of those seniors are selected at random and asked their opinion, what is the probability that more than 9 but fewer than 14 disapprove of smoking pot daily? Click here to see answer by stanbon(57303)

 Question 545783: A bag contains 20 blue and 15 green marbles. Two marbles, without replacement are drawn at random. What is the probability that both are blue? What is the probablity that at least one of them is blue? Click here to see answer by stanbon(57303)

 Question 545779: The accompanying table shows the percentages of residents in a large community when classified according to gender and presence of a particular allergy. ---------Allergy ------Present-----Absent Male----15----------36 Female--40----------39 Suppose that the selection of a person is considered a trial and the presence of the allergy is considered a success. For each case, identify the numerical value of p and find the required probability. Two males and two females are selected at random. What is the probability that none has the allergy? This problem is going to due soon. Please help me solve this problem ASAP. Thank you so much for your effort. Click here to see answer by stanbon(57303)

 Question 545763: Find the probability. A card is drawn from a well-shuffled deck of 52 cards. What is the probability of drawing a black card that is not a face card? Click here to see answer by stanbon(57303)

 Question 545840: A test has 50 questions, each with four possible answers. What's the chance of getting an A? Click here to see answer by JBarnum(2044)

 Question 546014: How would you write a number times ten to the fifth in standard form? Like, for instance, 5.48...thanks! Click here to see answer by moocow(3)

 Question 546226: a fair eight-sided dice with faces numbered 1 through is rolled four times. What is the probability that exactly one 3 is rolled, and that the 3 is rolled on the third roll? Click here to see answer by stanbon(57303)

 Question 546212: what is probability that mean annual percipitation during 1 randomly selected year will exceed 109.8 inches? mean = 107 inches standard deviation = 12 Click here to see answer by stanbon(57303)

 Question 546198: The average number of people in the United States, who quit smoking cigarettes weekly is 96. Assume the standard deviation is 16 people. If random samples of 36 smokers are selected, find the probability that the mean number of people who quit smoking is 90 and 100 people. Click here to see answer by stanbon(57303)

 Question 546191: Suppose you pay \$2.00 to roll a fair die with the understanding that you will get back \$4.00 for rolling a 4 or a 5, nothing otherwise. What is your expected value? Click here to see answer by stanbon(57303)

 Question 546163: 83 percent of people believe that it is morally wrong to not report all income on tax returns, what is the probability of those that do not believe this? Click here to see answer by stanbon(57303)

 Question 546123: You own 23 CDs. You want to randomly arrange 10 of them in a CD rack. What is the probability that the rack ends up in alphabetical order? The probability that the CDs are in alphabetical order is Click here to see answer by stanbon(57303)

 Question 546114: There are 25 students trying out for the basketball team. Only 10 are going to make the team. How many arrangements are possible to make up a team? Click here to see answer by stanbon(57303)

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