The following information is available for two samples selected from independent normally distributed populations.

Sample 1

Sample 2

Sample size

22

18

Sample variance

25

9

Sample Mean

14

16

At the 0.02 level ofsignificance, is there evidence of a mean difference between the two populations?

Note:Subscript 1 refers to Sample 1, 2 refers to Sample 2.

What are the null and alternative hypothesis?