Question: A random sample of six salespersons that attended a motivational course on sales techniques was monitored in the three months before and the three months after the course. The table shows the values of sales, in thousands of dollars, generated by these salespersons in the two periods. Assuming that the population distributions are normal, find an 80% confidence interval for the difference between the two population means.

Before After

Salesperson Course Course

1 212 237

2 282 291

3 203 191

4 327 341

5 165 192

6 198 180

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Deliverable: Word Document