We are interested in testing the following hypotheses. H0: P1-P2 0 Ha:P1-P2>0. The level of significance is set to 0.01. The critical value for this test is

A. 2.576

B. More information is needed

C. 2.33

D. 1.985

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 36 boxes is tested. The sample average weight is 12.85 ounces and the sample standard deviation is 0.75 ounces. Use the critical-value approach to test whether the population average weight of a cereal box differs from 13 ounces. The test statistics should be:

A. -1.20

B. -2.576

C. -2.35

D. -3.36

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 36 boxes is tested. The sample average weight is 12.85 ounces and the sample standard deviation is 0.75 ounces. Use the critical-value approach to test whether the population average weight of a cereal box differs from 13 ounces. The critical-value should be:

A. +/ -1.96

B. +/ -1.645

C. None of the other

D. +/ -2.576