EXERCISES. Exercise 1. Is mean human body temperature really 98.6 degrees, or is it lower or higher? H0: µ = 98.6 degrees Ha: µ ≠ 98.6 degrees SAMPLE n = 101 BLOOD DONORS AT CLINIC NEAR SEATTLE AGES 17 TO 84 SAMPLE MEAN = 97.89
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Imagine a researcher wants to determine whether or not a given drug has any effect on the scores of human subjects performing a task of ESP sensitivity. He randomly assigns his subjects to one of two groups. Nine hundred subjects in group 1 (the experimental group) receive an oral administration of the drug prior to testing. In contrast, 900 subjects in group 2 (control group) receive a placebo.
The null hypothesis (H0): There is no difference between the means of the drug group and no-drug group on the test of ESP sensitivity, that is H0: µ1 - µ2 = 0
This means essentially that the two populations are identical in ESP sensitivity after administration of the drug.
For the drug group, the mean score on the ESP test was 9.78, S.D. = 4.05, n = 900
For the no-drug group, the mean = 15.10, S.D. = 4.28, n= 900
The efficacy of a treatment for hypertension (high blood pressure) is to be studied using a clinical trial. Thirty-eight hypertensive patients were randomly allocated to Group 0 (placebo control) another 38 patients were assigned to Group 1 (treatment) and a three-month follow-up study was carried out. At the end of the study, the difference in blood pressure was measured for patients in each group and recorded.
A company wants to show, that a vitamin supplement decreases the recover time from a common cold. They selected randomly 70 adults with a cold. 35 of those were randomly selected to receive the vitamin supplement. The data on the recover time for both samples is shown below.