Statistics for laboratory scientists

Homework problems for lecture 18

1. I obtained the following measurements on 10 mice from each of two strains.

   Strain A:		55.2	58.1	41.7	44.9	44.8	48.9
   		47.5	48.1	48.4	51.6	40.6	48.0
   Strain B:		48.7	52.6	65.2	70.4	44.2	54.7
   		44.0	66.5	56.8

   Use the wilcox.test() function in R to perform a rank-sum test on these data (to test for a difference between the strains).

2. You might also wish to play with the perm.test() and paired.perm.test() functions which appear in comp18.R.

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Last modified: Thu Mar 2 12:57:24 EST 2006