A) Construct the indicated confidence interval for the population mean mu using the t-distribution c=0.95, x-overbar=12.7, s=2.0, n=9
The 95% confidence interval using a t-distribution is ( , )
B) A population has a mean mu=84 and a standard deviation sigma=28. Find the mean and standard deviation of a sampling distribution of sample means with sample size n=49.
mu-x=
Sigma-x=