Grandma Gertrudes chocolates a family owned business has a f

Grandma Gertrudes chocolates, a family owned business, has a family owned business, has an opportunity to supply its product for distribution through a large coffee house chain. In order to determine the mean % cacao in its dark chocolate products, quality inspectors sample 36 pieces. They find a samply mean of 55% with a standard deviation of 4%. What is the correct value of t* to construct a 90% confidence interval for the true mean % cacao?

A. 2.797

B. 1.318

C. 2.030

D.1.690

E. 1.711

Solution

Df = 36-1 =35

and 90% conf level required

Hence t value = D.1.690