Introductory Statistics (10th Edition)
10th Edition
ISBN: 9780321989178
Author: Neil A. Weiss
Publisher: PEARSON
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Chapter 12.3, Problem 126E
a.
To determine
Find the confidence interval for the difference between the two population proportions using two-proportion plus-four z-interval procedure.
b.
To determine
Compare the result from part (a) with the corresponding confidence interval found in part (d) of exercise 12.104.
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In each of Exercises, we have provided the sample standard deviations and sample sizes for independent simple random samples from two populations. In each case, use the two-standarddeviations F-test and the two-standard-deviations F-interval procedure to conduct the required hypothesis test and obtain the specified confidence interval.
s1 = 12.04, n1 = 25, s2 = 11.25, n2 = 21
a. right-tailed test, a = 0.10b. 80% confidence interval
In each of Exercises, we have provided the sample standard deviations and sample sizes for independent simple random samples from two populations. In each case, use the two-standarddeviations F-test and the two-standard-deviations F-interval procedure to conduct the required hypothesis test and obtain the specified confidence interval.
s1 = 14.5, n1 = 11, s2 = 30.4, n2 = 9
a. two-tailed test, a = 0.05b. 95% confidence interval
10.17 Refer to Exercise 10.16. Assuming that equal sample sizes will be taken from the two populations, how large a sample should be taken from each of the populations to obtain a 99% confidence interval for pA - pB with a width of at most .02? (Hint: Use p^ A = 0.3 and p^ B = .15 from Exercise 10.16.
Chapter 12 Solutions
Introductory Statistics (10th Edition)
Ch. 12.1 - Why is statistical inference generally used to...Ch. 12.1 - Prob. 3ECh. 12.1 - Prob. 4ECh. 12.1 - Regarding a sample proportion: a. What is it? b....Ch. 12.1 - Regarding the phrase number of successes: a. For...Ch. 12.1 - For what is the phrase number of failures an...Ch. 12.1 - Explain the relationships among the sample...Ch. 12.1 - Prob. 9ECh. 12.1 - Repeat parts (b)(e) of Exercise 12.9 for samples...Ch. 12.1 - Prob. 11E
Ch. 12.1 - Prob. 12ECh. 12.1 - Prob. 13ECh. 12.1 - Prob. 14ECh. 12.1 - Prob. 15ECh. 12.1 - Prob. 16ECh. 12.1 - Random Drug Testing. A Harris Poll asked Americans...Ch. 12.1 - Genetic Binge Eating. 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