a. Do these data indicate that the training has contributed to their performance? b. Find the 95 per cent confidence Interval of the training.
Eleven sales executive trainees are assigned selling jobs right after their recruitment. After a fortnight they are withdrawn from their field duties and given a month’s training for executive sales. Sales executed by them in thousands of rupees before and after the training, in the same period are listed below:
Sales Before Training Sales AfterTraining
23 24
20 19
19 21
21 18
18 20
20 22
18 20
17 20
23 23
16 20
a. Do these data indicate that the training has contributed to their performance?
b. Find the 95 per cent confidence Interval of the training.
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