A Cereal Manufacturer Is Concerned That the Boxes of Cereal $\alpha$

Multiple Choice

A cereal manufacturer is concerned that the boxes of cereal not be under filled or overfilled.Each box of cereal is supposed to contain 13 ounces of cereal.A random sample of 31 boxes is tested.The average weight is 12.58 ounces and the standard deviation is 0.25 ounces.Calculate a confidence interval to test the hypotheses at $\alpha$ = .10

A) [12.46 12.70]
B) [12.48 12.68]
C) [12.49 12.67]
D) [12.51 12.65]
E) [12.52 12.64]