Question: Surgery vs. placebo for knee pain:

"Is Arthroscopic Surgery Better Than Placebo?" Here we show MINITAB output comparing mean knee pain scores for the placebo (group 1) to debridement arthroscopic surgery (group 2).

1. State and interpret the result of the confidence interval.
2. State all steps and interpret the result of the significance test.
3. Based on the confidence interval and test, would you conclude that the arthroscopic surgery works better than placebo? Explain.

Sample N Mean St. Dev. SE Mean

1 60 51.6 23.7 3.1

2 59 51.4 23.2 3.0

Difference = mu (1) – mu (2)

Estimate for difference: 0.200000

95% CI for difference: (-8.316130, 8.716130)

T-Test of difference = 0 (vs not =):

T-Value = 0.05 P-Value = 0.963 DF = 117

Both use Pooled St. Dev. = 23.4535

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