Samples were collected from two ponds in the Bahamas to compare salinity values (in parts per thousand). Several samples were drawn at each site.

Pond 1: 37.03, 38.85, 36.72, 37.02, 37.32, 37.36, 37.71

Pond 2: 38.53, 38.66, 38.71, 40.08, 39.21

- Use a0.05 significance level to test the claim that the two ponds have the same mean salinity value.

1. What is the test statistic?