Question

need help with questions 7 and 8 please

We wish to know whether the population of ancient Egypt changed considerably in body structure during its existence. 126 skulls found from around 4000 B.C. had an average breadth of 70mm with standard deviation 7.1mm, and 129 skulle found from 200 BC had an average breadth of 84mm with standard deviation 6.7 . What is the most appropriate test for the researcher to use to test the theory that the average breadth of the skills increased over this period? O chi-squared test b.paired sample est O two sample t-test 42-test for the difference between two proportions QUESTIONS The high school GPA and college CPA of randomly selected students in a certain state are recorded. Researchers are interested in whether those with higher high school CPA's tend to do better in college MacBook Air

Answer 1

7. Here , there are two samples , each having a sample mean and a sample sd .

We want to test if the population mean has increased or not . As there are no population sd given , the most appropriate test for the given situation is a two sample t test .

8. Here we want to test if there is any positive relation between the high school GPA and college score or not .

So ,  regression test would be perfect for this case .