Confidence interval for the population mean

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a. A simple random sample of size n=12 is drawn from a population that is normally distributed. The sample mean is found to be x=63 and the sample standard deviation is found to be s=12. Construct a 95% confidence interval about the population mean

b. A simple random sample of size n=40 is drawn from a population. The sample mean is found to be x=120.3 and the sample standard deviation is found to be s=12.2. Construct a? 99% confidence interval for the population mean.

Reference no: EM132279470

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