Routine quality control checks are made on the contents of bags of potato chips

Question

Routine quality control checks are made on the contents of bags of potato chips labelled to weigh 6 ounces. During these checks, the contents of 9 randomly selected bags potato chips are weighed giving a sample mean weight of 6.2 ounces and a sample standard deviation of 0.3 ounces. What is the p?value associated with the claim that the population mean weight of potato chips differs from 6 ounces?

a. p?value < 0.025

b. 0.025 < p?value < 0.05

c. 0.05 < p?value < 0.1

d. p?value > 0.1

e. None of the above

Why is it C and not B?

Explanation / Answer

H0 = the population mean weight of potato chips differs from 6 ounces

H1 = the population mean weight of potato chips DOES NOT differs from 6 ounces

Degrees of freedom= 8

0.05 < p?value < 0.1

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