The Following Data, Drawn from a Normal Population, Are the Waiting

Essay

The following data, drawn from a normal population, are the waiting times (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 intervals for the population variance and the population standard deviation.