Question: A random sample of 10 miniature tootsie rolls was taken from a bag, each piece weighed on a very accurate scale. The results in grams were: 3.087 3.131 3.241 3.241 3.27 3.353 3.4 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 .03 grams with 90% confidence.

c) Discuss the factors which might cause variations in the weight of tootsie rolls during manufacturing.