Confidence interval for the true mean weight

Reference no: EM1316788

To find the 95% confidence interval and sample size.
A random sample of 10 miniature Tootsie Rolls was taken from a bag. Each piece was weighted on a very accurate scale. The results in grams were

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) Discuss factors which might cause variation in the weight of Tootsie Rolls during manufacture.

Reference no: EM1316788

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