Some research suggests that music influences how much time people spend in a store. To investigate this theory, a random sample of customers at a Paramount retail store was obtained (over a long...

Some research suggests that music influences how much time people spend in a store. To investigate this theory, a random sample of customers at a Paramount retail store was obtained (over a long period of time), and each was classified by the amount of time spent shopping (in minutes) and the type of music played during the day. The results are given in the following table.