BIOS 603

One Way Analysis of Variance (anova)

Learning Objective 44

1. Descriptive statistics for hospital length of stay for three DRG's are shown below. Test the null hypothesis that the three means are equal. There are 100 observations in each group.

DRG                                     Mean    s.d.
121 MI with complication (alive)       12.77    7.07
122 MI with no complication (alie)      9.24    3.79
123 MI (dead)                           6.39    7.41

2. Test the null hypothesis that the severity scores for the three groups are equal.

DRG       Mean   s.d.
121       12.51  6.75
122        9.19  3.79
123       16.05  8.94

Answer

Learning Objective 45
Conduct Newman-Keuls post hoc tests on the two sets of means shown for objective 38. Answer

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BIOS 603

One Way Analysis of Variance (anova)

Learning Objective 44

Learning Objective 45