7.4 Tests for Comparing t 2 Population variances Bio 7.18 A wildlife biologist w

Question

7.4 Tests for Comparing t 2 Population variances Bio 7.18 A wildlife biologist was interested in determining the effect of raising deer in captivity on the size of the deer. She decided to consider three populations: deer raised in the wild, deer raised on large hunting ranches, and deer raised in zoos. She randomly selected eight deerin each of three environments and weighed the deer at age 1 year. The weights (in pounds) are given in the following table. Environment Weight (in pounds) of Deer 114.7 128.9 111.5 116.4 134.5 126.7 120,6 129.59 Wild Ranch 120.4 91.0 119.6 119.4 150.0 169.7 100.9 76.1 Zoo 103.1 90.7 129.5 75.8 182.5 76.8 87.3 77.3 a. The biologist hypothesized that the weights of deer from captive environments would have a larger level of variability than the weights from deer raised in the

Explanation / Answer

data test;
input Environment $ W1-W8;
datalines;
Wild 114.7 128.9 111.5 116.4 134.5 126.7 120.6 129.59
Ranch 120.4 91.0 119.6 119.4 150.0 169.7 100.9 76.1
Zoo 103.1 90.7 129.5 75.8 182.5 76.8 87.3 77.3
;
run;
proc print data=test;
run;
proc ttest data=test h0=120;
run;

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