=+57. Pizza sales. A national food product company believes that it sells more frozen pizza during the winter months than during the summer months. Average weekly sales for a sample of stores in the Baltimore area over a three-year period provided the following data for sales volume (in pounds) during the two seasons.

Season N Mean StDev Minimum Maximum Winter 38 31234 13500 15312 73841 Summer 40 22475 8442 12743 54706