A public health official is interested in how social norms affect how much people exercise. She enrolls and randomly assigns subjects to two groups.

In Group A, each participant is asked to describe how often they exercise in front of an audience of their peers; the peer group is instructed to say that they exercise twice as often the participant.

In Group B, each participant is asked to do the same, but this peer group is instructed to say they exercise the same amount as the participant. Each group is then asked to describe their experience. Assume that any assumptions needed have been met.

Group A has a sample size of 20 and a mean of 15 exercise episodes.

Group B has a sample size of 20 and a mean of 17 exercise episodes.

The pooled standard error, i.e., estimate of the standard error in the population, is 3.

Suppose that the public health official uses a 2-tailed statistical test.

The critical value/s are +/- 2.0.

What should the public health official conclude?