In two independent samples from populations that are normally distributed, x-bar1 = 35.0, s1 = 5.8, n1 = 12 and x-bar2 = 42.5, s2 = 9.3, n2 = 14. Using the 0.05 level of significance, test H0: μ1 = μ2 versus H1: μ1 ≠ μ2.
Answer to relevant QuestionsIn two independent samples, x-bar1 = 165.0, s1 = 21.5, n1 = 40 and x-bar2 = 172.9, s2 = 31.3, n2 = 32. Using the 0.10 level of significance, test H0: μ1 ≥ μ2 versus H1: μ1 < μ2. The credit manager for Braxton’s Department Store, in examining the accounts for various types of customers served by the establishment, has noticed that the mean outstanding balance for a sample of 20 customers from the ...Using independent random samples, a researcher is comparing the number of hours of television viewed last week for high school seniors versus sophomores. The results are shown here. Assuming normal populations with equal ...A study of 102 patients who had digestive-tract surgery found that those who chewed a stick of gum for 15 minutes at mealtimes ended up being discharged after an average of 4.4 days in the hospital, compared to an average of ...The students in an aerobics class have been weighed both before and after the 5-week class, with the following results: Using the 0.05 level of significance, evaluate the effectiveness of the program. Using the appropriate ...
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