BIOSTATICS

Biostatics



Biostatistics Problems

Chapter 9 Problems 9.4

We use a paired t test, where di = (HgbA1c before - HgbA1c 3 months after) for the ith subject and d = -0.075, sd= 0.821, n = 8. We have the test statistic

Since t 7.975 = >/t/, we accept H0 at the 5% level.

9.12

We combine the two samples and rank-order the observations in the combined sample. We have

Value

The rank sum in the cataractous group is given by R1 = 1.0 + 2.0 + 3.0 + . . . . . 9.0 = 27.0. We use the exact test ...