The standard deviation for a population is σ=14.8. A sample of 21 observations selected from this population gave a mean equal to 139.05. The population is known to have a normal distribution. Round your answers to two decimal places. a. Make a 99% confidence interval for μ. ( Enter your answer; 99% confidence interval, lower bound ,Enter your answer; 99% confidence interval, upper bound ) b. Construct a 97% confidence interval for μ. ( Enter your answer; 97% confidence interval, lower bound ,Enter your answer; 97% confidence interval, upper bound ) c. Determine a 95% confidence interval for μ.

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