Suggested answer to exercise: Normal plot for angina and pronethalol, 4

Question 4: Do you think the data meet the conditions for a paired t test?

Suggested answer

No, they do not. The differences do not follow a Normal distribution and the variability is not uniform.

This could explain the discrepancy between the results of the sign test and the paired t test.

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Last updated: 30 October, 2006.

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