A random sample of six salespeople who attended a motivational course on sales techniques was monitored 3 months before and 3 months after the course. The table shows the values of sales (in thousands of dollars) generated by these six salespeople in the two periods. Assume that the population distributions are normal. Find an 80% confidence interval for the difference between the two population means.Salesperson Before the Course After the Course1 212 2372 282 2913 203 1914 327 3415 165 1926 198 180
A random sample of six salespeople who attended a motivational course on sales techniques was monitored 3 months before and 3 months after the course. The table shows the values of sales (in thousands of dollars) generated by these six salespeople in the two periods. Assume that the population distributions are normal. Find an 80% confidence interval for the difference between the two population means.
Salesperson Before the Course After the Course
1 212 237
2 282 291
3 203 191
4 327 341
5 165 192
6 198 180
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