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Biostatistics

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342 CHAPTER 8 ANALYSIS OF VARIANCE<br />

Dialog box:<br />

Session command:<br />

Stat ANOVA Twoway MTB > TWOWAY C1 C2 C3;<br />

SUBC > MEANS C2 C3.<br />

Type C1 in Response. Type C2 in Row factor and<br />

check Display means. Type C3 in Column factor and<br />

check Display means. Click OK.<br />

Output:<br />

Two-Way ANOVA: C1 versus C2, C3<br />

Analysis of Variance for C1<br />

Source DF SS MS F P<br />

C2 4 24.933 6.233 14.38 0.001<br />

C3 2 18.533 9.267 21.38 0.001<br />

Error 8 3.467 0.433<br />

Total 14 46.933<br />

Individual 95% CI<br />

C2 Mean ---+---------+----------+---------+--<br />

1 8.67 (-----*-----)<br />

2 9.00 (-----*-----)<br />

3 10.00<br />

(-----*-----)<br />

4 10.33<br />

(-----*-----)<br />

5 12.33<br />

(-----*-----)<br />

---+---------+----------+---------+--<br />

9.00 10.50 12.00 13.50<br />

Individual 95% CI<br />

C3 Mean ---+---------+----------+---------+--<br />

1 9.00 (-----*-----)<br />

2 9.60 (-----*-----)<br />

3 11.60<br />

(----*----)<br />

---+---------+----------+---------+--<br />

9.00 10.00 11.00 12.00<br />

FIGURE 8.3.2 MINITAB dialog box and output for two-way analysis of variance, Example 8.3.1.<br />

EXERCISES<br />

For Exercise 8.3.1 to 8.3.5 perform the ten-step hypothesis testing procedure for analysis of variance.<br />

8.3.1. The objective of a study by Brooks et al. (A-11) was to evaluate the efficacy of using a virtual<br />

kitchen for vocational training of people with learning disabilities. Twenty-four students participated

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