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Testing of hypothesis of sales

A manager hopes to improve the sales figures for 10 employees by sending them to a motivational seminar. To test the effectiveness of this seminar, the manager compares the sales figures for each salesperson for the month immediately prior to the seminar and the month immediately following it.

Employee before after
Homer 19 12
Bart 6 18
Lisa 9 12
Marge 5 7
Maggie 9 14
Ned 8 17
Milhouse 11 9
Willie 11 17
Stu 11 12
Gill 7 7

Run a statistical hypothesis test and determine if the seminar significantly improved sales figures for the company

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