A random sample of six salespersons that attended a motivational course on sales
ID: 3237466 • Letter: A
Question
A random sample of six salespersons that attended a motivational course on sales technique 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 salesperson in the two periods.
Assume that the population distributions are normal. Find a 90% confidence interval for the difference between the two population means.
Salesperson
Before the Course
After the Course
1
205
237
2
280
287
3
205
197
4
333
348
5
155
183
6
202
191
What is the confidence interval estimate of the mean difference (µ after - µ before)?
O µ O
(two answers)
Salesperson
Before the Course
After the Course
1
205
237
2
280
287
3
205
197
4
333
348
5
155
183
6
202
191
Explanation / Answer
The statistical software output for this problem is:
Paired T confidence interval:
D = 1 - 2 : Mean of the difference between After the Course and Before the Course
90% confidence interval results:
Hence,
90% confidence interval will be:
(-4.24, 25.24)
Difference Mean Std. Err. DF L. Limit U. Limit After the Course - Before the Course 10.5 7.3155086 5 -4.2411032 25.241103Related Questions
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