Question: A random sample of 10 shoppers is selected from Europa Shopping Center to determine the average distance customers travel to the mall. The observed sample (in km) is the following: 5, 1, 15, 20, 3, 4, 5, 4, 0, 7.

We assume the normally distributed distance.

a) Find a 90% confidence interval for the expected value of the distance! Interpret it!

b) Estimate and interpret the maximal distance! Assume a 95% confidence level!

c) Find a 95% confidence interval for the population standard deviation! Interpret it!