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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 percent 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 percent confidence?
c) Discuss the factors which might cause variation in the weight of Tootsie Rolls during manufacture.
A sample of n = 5 scores has a mean of M = 12. If one person with a score of X = 8 is removed from the sample, what will be the value of the new mean?
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Find the 90%, 95% and 99% confidence intervals for the proportion of all voters who favor the issue. How many more voters should we include in the sample if we need to reduce the margin of error by half?
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