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(Solved): Suppose the scores of a new standardized math test are Normally distributed with an unknown mean and ...
Suppose the scores of a new standardized math test are Normally distributed with an unknown mean and an unknown standard deviation. A simple random sample of
n=25students yields an average score of
\bar{x} =525and a standard deviation of
s=60. (a) Construct and interpret a
90%confidence interval for the population mean. (b) Construct and interpret a
95%confidence interval for the population mean. (c) What sample size would be needed to make the margin of error for the
90%confidence no more than 7 . (d) What sample size would be needed to make the margin of error for the
95%confidence no more than 7 .
