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7.3 HYPOTHESIS TESTING: THE DIFFERENCE BETWEEN TWO POPULATION MEANS 245<br />

Dialog box:<br />

Stat ➤ Basic Statistics ➤ 2-Sample t<br />

Choose Samples in different columns. Type C1<br />

in First and C2 in Second. Click the Options box<br />

and select “less than” in the Alternatives box.<br />

Check Assume equal variances. Click OK.<br />

Session command:<br />

MTB > TwoSample 95.0 C1 C2<br />

SUBC> Alternative 1,<br />

SUBC> Pooled.<br />

Output:<br />

Two-Sample T-Test and CI: C, SCI<br />

Two-sample T for C vs SCI<br />

N Mean StDev SE Mean<br />

C 10 126.1 21.8 6.9<br />

SCI 10 133.1 32.2 10<br />

Difference mu C mu SCI<br />

Estimate for difference: 7.0<br />

95% upper bound for difference: 14.3<br />

T-Test of difference 0 (vs

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