Question

In: Statistics and Probability

Can you give me each step of this problem? A researcher would like to evaluate the...

Can you give me each step of this problem?

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

  • Compute the mean and variance for the sample of difference scores.
  • Do the results indicate a significant difference?
  • Use a two-tailed test with α = .05
  • Compute Cohen’s d to measure the size of the effect.

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