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Six different national brands of chocolate chip cookies were randomly selected at the supermarket. The grams...

Six different national brands of chocolate chip cookies were randomly selected at the supermarket. The grams of fat per serving are as follows: 9; 9; 11; 7; 8; 8. Assume the underlying distribution is approximately normal. NOTE: If you are using a Student's t-distribution, you may assume that the underlying population is normally distributed. (In general, you must first prove that assumption, though.)

1) Calculate a 90% confidence interval for the population average grams of fat per serving of chocolate chip cookies sold in supermarkets.

(i) State the confidence interval.

(ii)Calculate the error bound.

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