5,6 and 7

QUESTION 5 15 You are an environmental engineer researching whether dams in poor condition are older than dams in adequate condition. You notice that poor condition dams have a large spread of ages while most of the adequate condition dams were built in the 1950s and 1960s. In qq plots of each sample, you see that the data line up with the z-scores pretty well, forming a straight line. Choose the best type of test of two means to assess this research question. One-sided paired t-test Two-sided Mann Whitney U test One-sided unpooled variance t-test One-sided Mann-Whitney U test O Two-sided unpooled variance t-test One-sided pooled variance t-test QUESTION 6 5 You are a high-school track coach and want to know if your weight-lifting training program is working. You randomly select 12 athletes to participate in the weight-lifting and the other 15 runners just do the normal track workouts. Then you analyze each group's average time to run 200m. In qq plots of each sample, you see that the data line up with the z-scores pretty well, forming a straight line. Choose the best type of test of two means to assess this research question. O Two-sided Mann Whitney U test One-sided pooled variance t-test One-sided paired t-test O One-sided Mann-Whitney U test O One-sided unpooled variance t-test O Two-sided unpooled variance t-test QUESTION 7 5p Whenn1 = 5, n2 = 5, and alpha = 0.05, find the two-tailed U-table value