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Suppose that a group of employees are given training regarding efficient practic

ID: 3183130 • Letter: S

Question

Suppose that a group of employees are given training regarding efficient practices. The average number of product they produce is recorded for 24 months before and after the training to see if there is any increase in productivity.

(a) Circle the correct evidence for or against the assumptions needed to do any test or confidence interval for the difference between these two time periods. Circle them (and only the correct plot(s)) and denote them by ”a)”. In the space below, state whether or not the assumptions seem to hold and why.

(b) Find an appropriate hypothesis test on the JMP output for testing if the difference ”Before” and ”After” the training if there is a difference in the amount of products created with = 0.05. State the p-value and a very simple decision (Reject, Don’t Reject). Circle the test in the output and label it ”b)”.

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Explanation / Answer

Result:

Suppose that a group of employees are given training regarding efficient practices. The average number of product they produce is recorded for 24 months before and after the training to see if there is any increase in productivity.

(a) Circle the correct evidence for or against the assumptions needed to do any test or confidence interval for the difference between these two time periods. Circle them (and only the correct plot(s)) and denote them by ”a)”. In the space below, state whether or not the assumptions seem to hold and why.

Correct plot : After-before

The assumptions are hold .

(b) Find an appropriate hypothesis test on the JMP output for testing if the difference ”Before” and ”After” the training if there is a difference in the amount of products created with = 0.05. State the p-value and a very simple decision (Reject, Don’t Reject). Circle the test in the output and label it ”b)”.

Test statistic =1.1455

P=0.2638

Don’t Reject

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