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    Statistics - Confidence Interval

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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. 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 + or - 0.03 grams with 90% confidence? c)Discuss the factors which might cause variation in the weight of tootsie roll during manufacture.

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