The manufacturer of a refrigerator system for beer kegs produces refrigerators that are supposed to maintain a true mean temperature, , of 41F, ideal for a certain type of German pilsner. The owner of the brewery does not agree with the refrigerator manufacturer, and claims he can prove that the true mean temperature is incorrect. Assuming that a hypothesis test of the claim has been conducted and that the conclusion is to reject the null hypothesis, state the conclusion in nontechnical terms.

a. There is not sufficient evidence to support the claim that the mean temperature is different from .

b. There is sufficient evidence to support the claim that the mean temperature is equal to .

c. There is sufficient evidence to support the claim that the mean temperature is different from .

d. There is not sufficient evidence to support the claim that the mean temperature is equal to .