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 euros) 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.

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Salesperson 1 2345 6 Before the Course 210 289 212 327 163 205 After the Course 235 301 196 340 191 194