As player salaries have increased, the cost of attending basketball games has increased dramatically. The file NBA Cost contains the cost of four averaged-priced tickets, two beers, four soft drinks, four hot dogs, two game programs, two adult-sized caps, and one parking space at each of the 30 National Basketball Association arenas during the 2014-2015 season.
Decide whether the data appear to be approximately normally distributed by
a. Comparing data characteristics to theoretical properties.
b. Constructing a normal probability plot.