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 the test statistic to test these hypotheses.
A)9.35
B)-9.35
C)4.68
D)-4.68
E)-1.68

Question

Quizplus · Accepted Answer

The test statistic is calculated using the formula: (sample mean - population mean) / (standard deviation / sqrt(sample size)). Substituting the given values: (12.58 - 13) / (0.25 / sqrt(31)) = -9.35.

A Cereal Manufacturer Is Concerned That the Boxes of Cereal