Package weights. Students investigated the packaging of potato chips. They purchased 6 bags of Lay’s Ruff les marked with a net weight of 28.3 grams. They carefully weighed the contents of each bag, recording the following weights (in grams): 29.3, 28.2, 29.1, 28.7, 28.9, 28.5. (Data in Ruff les)

a) Do these data satisfy the assumptions for inference?

Explain.

b) Find the mean and standard deviation of the weights.

c) Test the hypothesis that the net weight is as claimed.