Use the information to find the minimum sample size

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5) Use the information to find the minimum sample size required to estimate an unknown population mean µ.
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6) Solve the problem.A 99% confidence interval (in inches) for the mean height of a population is 65.7 < µ < 67.3. This result is based on a sample of size 144. Construct the 95% confidence interval. (Hint: you will first need to find the sample mean and sample standard deviation).Refer to page 273 of Business Statistics.
7) Use the given degree of confidence and sample data to find a confidence interval for the population standard deviation. Assume that the population has a normal distribution.
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