=+58. More pizza sales. Here’s some additional information about the pizza sales data presented in Exercise 57. It is generally thought that sales spike during the weeks leading up to AFC and NFC football championship games, as well as leading up to the Super Bowl at the end of January each year. If we omit those 6 weeks of sales from this three-year period of weekly sales, the summary statistics look like this.

Season N Mean StDev Minimum Maximum Winter 32 28995 9913 15312 48354 Summer 40 22475 8442 12743 54706