Question:

a. State and interpret the result of the confidence interval

b. State all steps and interpret the result of the significance test

c. Based on the confidence interval and test, would you conclude that the arthroscopic surgery works better than placebo? Explain

Refer to Example

Compare knee pain score for the placebo (group 1) to debridement arthroscopic surgery (group 2)

SAMPLE

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