Question

A soft drink distributor was interested in examining the relationship between the number of ads (x) for his product during prime time on a local television station and the number of sales per week (y) in 1000’s of cases. He compiled the figures for 20 weeks and computed the following summary information: n=20, sum of x=92, sum of y=177, sum product of x and y=884, stdev of x=1.3917 and stdev of y=2.9069. Find the correlation coefficient for the number of ads during prime time
weekly sales.

Answer 1

There are several variations of the correlation coefficient formula. Find the one that will use the data given in your problem, then calculate r.

Answer 2

.9081