Bags of certain brand of tortilla chips claim to have net weight of 14 oz. Net weights actually vary slightly from bag to bag. Suppose net weights are Normally distributed. A representative of consumer advocate group wishes to see if there is any evidence that mean net weight is less than advertised and so intends to test the hypotheses H0: ? = 14, Ha: ? < 14. To do this, he chooses 16 bags of tortilla chips of this brand at random and estimates the net weight of each. He finds out a sample mean of 13.88 oz with standard deviation of s = 0.24 oz.
Reference: Ref 7-3
Determine the value of the test statistic? Round to 2 decimal places.