Question

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 7.3mm, and 129 skulls found from 200 B.C. had an average breadth of 84mm with standard deviation 6.7mm. What is the most appropriate test for the researcher to use to test the theory that the average breadth of the skulls increased over this period?

z-test for the difference between two proportions

chi-square test

paired sample t-test

two sample t-test

Answer 1

Here we have quantitative data of two samples and the samples are independent. Hence,

We would use two sample t-test.