1. -4 points DevoreStat9 9,E.063 My Notes Ask Your Teacher Toxaphene is an insec

Question

1. -4 points DevoreStat9 9,E.063 My Notes Ask Your Teacher Toxaphene is an insecticide that has been identified as a pollutant in the Great Lakes ecosystem. To investigate the effect of toxaphene exposure on animals, groups of rats were given toxaphene in their diet. A study reports weight gains (in grams) for rats given a low dose (4 ppm) and for control rats whose diet did not include the insecticide. The sample standard deviation for 22 female control rats was 29 g and for 18 female low-dose rats was 54 g. Does this data suggest that there is more variability in low-dose weight gains than in control weight gains? Assuming normality, carry out a test of hypotheses at significance level 0.05.

Explanation / Answer

from above std deviation for low dose s1 =54 gm

and for control group s2=29

hence test stat F=(s1/s2)2 =(54/29)2 =3.47

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