A researcher wants to test whether a drinking a new protein shake daily changes cholesterol levels.It is not known whether the protein drink will increase or decrease cholesterol. In the general population, cholesterol is normally distributed with m = 200 and s = 30. A person who has followed the protein shake regimen for two months is randomly selected, and his cholesterol is 135. Using the .05 level of significance, what should the researcher conclude? Please use the five steps of significance testing.

Restate the question as a research hypothesis and a null hypothesis about the populations.

Determine the characteristics of the comparison distribution.

Determine the cutoff sample score (or critical value) on the comparison distribution at which the null hypothesis should be rejected.

Determine your sample's score on the comparison distribution.

Decide whether to reject the null hypothesis.