Using the following data for the next 2 questions: A sample of size 25 is taken randomly yield sample standard deviation is 8.

Using the following data for the next 2 questions:A sample of size 25 is taken randomly yield sample standard deviation is 8. Assume that the population follows normal distribution and population standard deviation is unknown. The 95% confidence interval about the population mean is [56.697, 63.303]. 4.