A random sample of 21 nickels measured with a very accurate
micrometer showed a mean diameter of 0.834343 inches with a standard deviation
of 0.001886 inches. (a) Why would nickel diameters vary? (b) Construct a 99
percent confidence interval for the true mean diameter of a nickel. (c) Discuss
any assumptions that are needed. (d)What sample size would ensure an error
of±0.0005 inches with 99 percent confidence? (Data are from a project by MBA
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