Manny's brand ofsuper chocolate chip cookiesis supposed to contain 100 chocolate chips in each cookie. The standard deviation for the number of chocolate chips in each cookie is 21 (you can think of this claim as representing the whole population of cookies).

You decide to conduct a z test because you think his cookies contain less chips than he claims. You count the number of chocolate chips in asampleof 9 cookies and find that their average is 85 chocolate chips per cookie.

What do you conclude about Manny's claim about the number of chips in hissuper chocolate chip cookies?

A. Manny is exaggerating his claim because the obtained value did not exceed the critical value.

B. Manny is telling the truth because the obtained value exceeded the critical value.

C. Manny is telling the truth because the obtained value did not exceed the critical value.

D. Manny is exaggerating his claim because the obtained value exceeded the critical value.