Discussion:
Q: An article in Baltimore Sun claimed that the typical supermarket trip takes a mean of 22 minutes. Suppose that in an effort to test this claim, you select a sample of 50 shoppers at a Baltimore City Giant. The mean shopping time for the sample of 50 shoppers is 25.36 minutes, with a standard deviation of 7.24 minutes (estimated from the sample). Using the 0.10 level of significance, is there evidence that the mean shopping at the Baltimore City Giant is different from the claimed value of 22 minutes?