The Following Data,drawn from a Normal Population,is the Waiting Time

Essay

The following data,drawn from a normal population,is the waiting time (in minutes)of 12 randomly selected customers at a travel desk.
1.8,2.4,2.7,2.1,1.3,1.7,1.5,1.5,2.3,2.8,2.5,1.9
A)Calculate the point estimates of the population variance and the population standard deviation.
B)Compute a 90% confidence interval for the population variance and the population standard deviation.