Bags of a certain brand of tortilla chips claim to have a net weight of 14 ounces. Net weights actually vary slightly from bag to bag and are Normally distributed with mean. A representative of a consumer advocate group wishes to see if there is any evidence that the mean net weight is less than advertised so he intends to test the following hypotheses:

H0:= 14,Ha:< 14

To do this, they select 16 bags of this brand at random and determines the net weight of each. The sample mean is= 13.88 and thesample standard deviationiss= 0.24.

Reference: Reference 3

What is the test statistic for this problem?

Group of answer choices

, and this has a t-distribution

, and this has a Z (normal) distribution

, and this has a t-distribution

and this has a Z (normal) distribution