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Chapter 10: Q.10.132 (page 443)
Measuring Treadwear. Refer to Exercise 10.126 and find a confidence interval for the mean difference in measurement by the weight and groove methods.
is the data's confidence interval.
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Recess and Wasted Food. Refer to Exercise 10.50 and find a 98% confidence interval for the difference between the mean amount of food wasted for lunches before recess and that for lunches after recess.
Suppose that you want to perform a hypothesis test to compare the means of two populations, using a paired sample. For each part, decide whether you would use the paired -test, the paired Wilcoxon signed-rank test, or neither of these tests if preliminary data analyses of the sample of paired differences suggest that the distribution of the paired-difference variable is
a. approximately normal.
b. highly skewed; the sample size is .
c. symmetric bimodal.
Fortified Juice and PIH. Refer to Exercise 10.47 and find a 90% confidence interval for the difference between the mean reductions in PTH levels for fortified and unfortified orange juice.
In each of Exercises 10.75-10.80, we have provided summary statistics for independent simple random samples from non populations. In each case, use the non pooled test and the non pooled interval procedure to conduct the required hypothesis test and obtain the specified confidence interval.
a. Two-tailed test,
b. confidence interval.
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