Telemarketers generally read from a prepared script when they make their sales calls. A firm decides to change this prepared script, making it both friendlier and shorter. The numbers of daily sales are recorded for a random sample of telemarketers, before and after the script change. The data are shown in Exhibit 9.38.

Do the data suggest that there is a difference in the numbers of daily sales before and after the script change? Use α = 0.05.

Sales Before Script Change 52 35 47 Sales After Script Change 63 57 78 69 63 47 36 51 62 45 29 49