In this exercise we will use the Independent Samples T-test.

Create a new boxplot using BODYFAT as the variable of interest and comparing the two age-groups, rather than ADIPOSITY as in the previous exercise. Do you think there is a difference between the two groups?

We can perform a statistical test to see if there is a ‘significant’ difference between the means of the groups. The appropriate test for this analysis is the Independent samples t-test. This is useful for comparing two groups which do not share any members. In this case, nobody under 40 is also over 40.