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What is the true mean weight of the miniature tootsie rolls?

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A random sample of 10 miniature tootsie rolls was taken from a bag, each piece was weighed on a very accurate scale.

Results: 3.087 3.131 3.241 3.241 3.270 3.353 3.400 3.411 3.437 3.477

a) Construct a 90% confidence interval for the true mean weight.
b) What sample size would be necessary to estimate the true weight with an error of +/- 0.03 grams with 90% confidence?
c) What factors could cause variations in the weight of tootsie rolls during manufacture?

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Solution Summary

This solution provides calculations for confidence intervals and sample size.

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