Can someone help me figure out this problem Please?
A random sample of 10 miuniature Toootsie Rolls wa taken from a bag. Each piece was weighed on a very accurate scale. The results in grams were
3.087 3.131 3.241 3.241 3.270 3.553 3.440 3.411 3.437 3.477
(a) contruct a 90 percent confidence interval for the ture mean weight. (b) what sample size would be necessary to estimate the true weight of +_ 0.03 grams with 90 percent confidence? (c) Discuss the factors which might cause a variation in the weight of Tootsie Rolls during manufacture.