A researcher would like to evaluate the effectiveness of a

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Reference no: EM13608000

A researcher would like to evaluate the effectiveness of a pain-relief patch designed for lower back pain. Prior to testing the patch, each of n = 8 patients rates the current level of back pain on a scale from 1 to 10. After wearing the patch for 90 minutes, a second pain rating is recorded. The data are as follows:

Before			After
	6	2
	8	3
	9	4
	8	1
	10	2
	5	3
	9	8
	7	7

a. Compute the mean and variance for the sample of difference scores.

b. Do the results indicate a significant difference? Use a two-tailed test with a= .05

c. Compute Cohen's d to measure the size of the effect.

Reference no: EM13608000

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