5.Consider again the conditions and observed values of Exercise 2. However, suppose now that each observation for drug A has an unknown variance....and each observation for drug B has an unknown variance....but it is known that....Test the hypotheses described in Exercise 2 at the level of significance 0.10.
6.Suppose that........form a random sample from a normal distribution with unknown mean...and unknown variance..and....form an independent random sample from another normal distribution with unknown mean..and the same unknown variance....For each constant...,construct a t test of the following hypotheses with.....degrees of freedom
7.Consider again the conditions of Exercise 2. Let...denote the mean of each observation for drug A,and let..denote the mean of each observation for drug B. It is assumed. as in Exercise 2, that all the observations have a common unknown variance.Use the results of Exercise 6 to construct a confidence interval for .....with confidence coefficient 0.90
8.In Example 8.6.2, determine the power of a level 0.01 test if.....
9. Suppose that we wish to test the hypotheses (8.6.8).we shall use the statistic U defined in Eq. (8.6.3)and reject .......is large. Prove that the p-value when U=u is observed is 2
10.Lyle et al. (1987) ran an experiment to study the effect of a calcium supplement on the blood pressure of African-American males. A group of 10 men received a calcium supplement, and another group of 11 men received a placebo. The experiment lasted 12 weeks. Both before and after the 12-week period, each man had his systolic blood pressure measured while at rest. The changes (after minus before) are given in Table 8.1. Test the null hypothesis that the mean change in blood pressure for the calcium supplement group is lower than the mean change in blood pressure for the placebo group. Use level........
5.Consider again the conditions and observed values of Exercise 2. However, suppose now that each observation for drug A has an unknown variance....and each observation for drug B has an unknown variance....but it is known that....Test the hypotheses described in Exercise 2 at the level of significance 0.10.
6.Suppose that........form a random sample from a normal distribution with unknown mean...and unknown variance..and....form an independent random sample from another normal distribution with unknown mean..and the same unknown variance....For each constant...,construct a t test of the following hypotheses with.....degrees of freedom
7.Consider again the conditions of Exercise 2. Let...denote the mean of each observation for drug A,and let..denote the mean of each observation for drug B. It is assumed. as in Exercise 2, that all the observations have a common unknown variance.Use the results of Exercise 6 to construct a confidence interval for .....with confidence coefficient 0.90
8.In Example 8.6.2, determine the power of a level 0.01 test if.....
9. Suppose that we wish to test the hypotheses (8.6.8).we shall use the statistic U defined in Eq. (8.6.3)and reject .......is large. Prove that the p-value when U=u is observed is 2
10.Lyle et al. (1987) ran an experiment to study the effect of a calcium supplement on the blood pressure of African-American males. A group of 10 men received a calcium supplement, and another group of 11 men received a placebo. The experiment lasted 12 weeks. Both before and after the 12-week period, each man had his systolic blood pressure measured while at rest. The changes (after minus before) are given in Table 8.1. Test the null hypothesis that the mean change in blood pressure for the calcium supplement group is lower than the mean change in blood pressure for the placebo group. Use level........
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