A random sample of six salespersons that attended a motivational course on sales techniques was monitored three months before and three months after the course. The table shows the values of sales (in thousands of dollars) generated by these six salespersons in the two periods. Salesperson Before the Course After the Cou 217 242 284 292 3 196 192 4 330 351 158 190 6 198 179 Assume that the population distributions are normal. Find an 80% confidence interval for the difference between the two population means. What is the confidence interval estimate of the mean difference (Hafter - Hpefore)? (Round to two decimal places as needed.)

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A random sample of six salespersons that attended a motivational course on sales techniques was monitored
three months before and three months after the course. The table shows the values of sales (in thousands of
dollars) generated by these six salespersons in the two periods.
Salesperson Before the Course After the Course
217
242
284
292
3
196
192
4
330
351
5
158
190
198
179
Assume that the population distributions are normal. Find an 80% confidence interval for the difference between the two population means.
What is the confidence interval estimate of the mean difference (uafter - Hbefore)?
(Round to two decimal places as needed.)
Transcribed Image Text:A random sample of six salespersons that attended a motivational course on sales techniques was monitored three months before and three months after the course. The table shows the values of sales (in thousands of dollars) generated by these six salespersons in the two periods. Salesperson Before the Course After the Course 217 242 284 292 3 196 192 4 330 351 5 158 190 198 179 Assume that the population distributions are normal. Find an 80% confidence interval for the difference between the two population means. What is the confidence interval estimate of the mean difference (uafter - Hbefore)? (Round to two decimal places as needed.)
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