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The table below summarizes baseline characteristics on patients participating in a clinical trial.

The table below summarizes baseline characteristics on patients participating in a clinical trial.

Characteristic Placebo Experimental P
(n=125) (n=125)
Mean (+ SD) Age 54 +/- 4.5 53 +/- 4.9 0.7856
% Female 39% 52% 0.0289
Mean (+ SD) Total Cholesterol 214 +/- 24.9 210 +/- 23.1 0.8954
% Current Smokers 17% 15% 0.5741
% with Diabetes 8% 3% 0.0438

Write the hypotheses and the test statistic used to compare ages between groups. (No calculations – just H0, H1 and form of the test statistic)

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Statistics and Probability  - 8210062.doc

Let µ1 be the mean age of females under placebo and let µ 2 be the mean age of females
under experimental
HO: µ1 = µ 2
H1: µ1 ≠ µ 2 Test statistic: x1 − x 2 t=
S2( 1
1
+)
n1 n2

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