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

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Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.