3 5. A random sample of six salespersons who had attended a motivational coarse on sales techniques was monitored in the 3 months before and the 3 months after the course. The table shows the values of sales, in thousands of dollars, generated by these six 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.
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If you're like a lot of people watching the recession unfold, you have likely started to look at your finances under a microscope. Perhaps you have started saving the annual savings rate by people has started to recover a bit.