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For each hypothesis test show all four steps. Number 5 just respond to each item. At a local college, 65 female students were randomly selected and it was found that their mean monthly income was $623 with a standard deviation of $121.50. Also 75 male students were randomly selected and their mean monthly income was $665 with a standard deviation of $168.70. Test the claim that the males have a higher monthly income than the females. Use alpha= .01. A study was conducted to determine if the salaries of elementary school teachers from two neighboring districts were equal. A sample of 15 teachers from each district was randomly selected. “The mean from the first district was” $28,900 with a standard deviation of $2300. The mean from the second district was $30,300 with a standard deviation of $2100. Use alpha=.05. A pharmaceutical company wishes to test a new drug with the expectation of lowering cholesterol levels. Ten subjects are randomly selected and pretested. The results are listed below. The subjects were placed on the drug for a period of 6 months, after which their cholesterol levels were tested again. The results are listed below. (All units are milligrams per deciliter.) Test the company’s claim that the drug lowers cholesterol levels using alpha =.01. Subject 1 2 3 4 5 6 7 8 9 10 Before 195 225 202 195 175 250 235 268 190 240 After 180 220 210 175 170 250 205 250 190 225 A recent survey showed that in a sample of 100 elementary school teachers,15 smoked. In a sample of 180 high school teachers, 36 smoked. Is the proportion of high school teachers who smoke greater than the proportion of elementary teachers who smoke? Use alpha=.01. The data below are the final exam scores of 10 randomly selected statistics students and the number of hours they studied for the exam. Find...
Apr 25 2020 View more View Less
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