ags of a certain brand of tortilla chips claim to have a net weight of 14 ounces. et weights actually vary slightly from bag to bag and are Normally distributed with ean . A representative of a consumer advocacy group wishes to see if there is ny evidence that the mean net weight is less than advertised and so intends to est the hypotheses and . Taking a random sample of 81 bags, they find mean of the sample to be 13.8 and the standard deviation is 0.9. Calculate the test statistic