Question: The sugar content in a one-cup serving of a certain breakfast cereal was measured for a sample of 140 servings. The average was 11.9 g

The sugar content in a one-cup serving of a certain breakfast cereal was measured for a sample of 140 servings. The average was 11.9 g and the standard deviation was 1.1 g.

a. Find a 95% confidence interval for the mean sugar content.

b. Find a 99% confidence interval for the mean sugar content.

c. What is the confidence level of the interval (11.81, 11.99)?

d. How large a sample is needed so that a 95% confidence interval specifies the mean to within±0.1?

e. How large a sample is needed so that a 99% confidence interval specifies the mean to within±0.1?

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a X 119 s 11 n 140 z 025 196 The confidence interval is 119 19611140 or 11718 12082 b X 119 s ... View full answer

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