Question

A consumer advocacy group has received complaints that a particular potato chip manufacturer is producing bags that contain less than the advertised 1.75 ounces of chips. A SRS of 150 bags of flour is weighed and the sample mean weight is found to be 1.74 ounces. If we assume a population standard deviation of 0.08 ounces, use a hypothesis test to test the claim that the bags are being under-filled.

1: What is the null hypothesis?
2: What is the alternative hypothesis?

Answer 1

Null (H0) : Mean chips weight = 1.75 , Alternate (H1) : Mean chips weight < 1.75

Explanation:

Null Hypothesis states no deviation from considered population parameter.

Alternate Hypothesis states deviation from considered population parameter. If anticipated deviation may be more or less, its two tail test. If anticipated deviation is only more or less, its left or right tail test .

Null Hypothesis [H0] : Average chips weight = 1.75 ounce

Alternate Hypothesis [H1] : Average chips weight < 1.75 ounce {Left Tail Test}