The results of a mathematics placement exam for samples of 2

The results of a mathematics placement exam for samples of 2013 and 2014 entering freshmen are as follows:

Class

Sample Size

Mean

Sample SD

2013

330

33

8

2014

310

31

7

23. What is the best point estimate of the difference between the scores of freshmen in the two years?

Solution

best point estimate is actually the difference between sample means i.e, 33-31 = 2