A time series plot similar to the one shown here appeared in a recent advertisement for a wellknown golf magazine. One person might interpret the plot's message as the longer you subscribe to the magazine, the better golfer you should become.

Another person might interpret it as indicating that if you subscribe for 3 years, your game should improve dramatically.

1 2 3 Length of subscription

(years)

a. Explain why the plot can be interpreted in more than one way.

b. How could the plot be altered to rectify the current distortion?