Question

7)The value for χ right for a 95% confidence interval when n-15 is 26.1 19. 7) A) False B) True 8) A study of nickels showed that the the standard deviation of the weight of nickels is 150 8) milligrams. A coin counter manufacturer wishes to find the 90% confidence interval for the average weight of a nickel. How many nickels does he need to weigh to obtain an average accurate to within 25 milligrams? A) 99 B) 139 36 9) A contractor decided to build homes that will include the middle 80% of the market. If 9) the average size of homes built is 1810 square feet, find the maximum and minimum sizes of the homes the contractor should build. Assume that the standard deviation is 92 square feet and the variable is normally distributed. A) 1692.24 and 1927.76 C) 1732.72 and 1887.28 B) 1727.2 and 1892.8 D) 1800.8 and 1819.2 10) Is the statement Ho: 11 a valid null hypothesis? 10) A) Yes, this is a statement that compares two parameters. B) No, equalities are not permitted in a null hypothesis. c) Yes, this is a statement that compares a parameter to a value. D) No, there is no parameter contained in this statement 11) In a study using 8 samples, and in which the population variance is unknown, the distribution that should be used to calculate confidence intervals is A) a t distribution with 9 degrees of freedom. B) a t distribution with 8 degrees of freedom. C) a t distribution with 7 degrees of freedom. D) a standard normal distribution. 12) Thirty-seven members of a bowling league sign up for a program that claims to improve 12) bowling scores. The participants bowl a set of five games before the program begins and a set of five games again at the end to measure their improvement The mean number of points improved (over the set of five games) was x 17. Assume the standard deviation is σ-62 and let μ be the population mean number of points improved for the set of five games. To determine whether the program is effective, a test is made of the hypotheses H0: μ-0 versus H1 : μ > 0. Compute the value of the test statistic. D) 1.67 C) 0.27 B) 0.0475 A) 13.13

Answer 1

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EXPLANATION:

7)

YES IT IS TRUE

FOR A 95% CONFIDENCE INTERVAL WHEN N=15 IS 26.119

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