A random sample is drawn from a normally distributed population of unknown standard deviation. Construct a 99% confidence interval for the population mean based on the information given. (Write your...

 A random sample is drawn from a normally distributed population of
unknown standard deviation. Construct a 99% confidence interval for the
population mean based on the information given. (Write your answers in 1
d.p and use the critical value for t or the t-distribution table)
a. n = 18, ? = 386, s = 24
b. n = 7, ? = 386, s = 24