-4 points DevoreStat9 9.E.063 My Notos Ask Your Toxaphene is an insecticide thot

Question

-4 points DevoreStat9 9.E.063 My Notos Ask Your Toxaphene is an insecticide thot has been identified as a pollutant in the Great Lakes ecoaystem. To investigate the effect of toxaphene exposure on animals, groups of rats were given toxaphenc in their diet. A study reports weight gains (in grama) for rats given a low dose (4 ppm) and for control rats whose diet did not include the insecticidc. The sample standard dewiation for 22 female contral rats was 28 g and for 15 femalc low doee rats was 56 g. Does this data suggest that there s more variability in low dosc weight gains than in contral weight gains? Asuming normality, carry out a test of hypatheses at significance lavel 0.0s State the relavant hypotheses. (Use 1 for low-dose treatment and e2 for contral condition.) Ha: 12 22 Ho: 12- Mai 012 22 Calculate the test statistic. (Round your answer to two decimal places.) What can be said about the P-value for the test? Pvalue 0.100 0.050

Explanation / Answer

The statistical software output for this problem is:

Two sample variance summary hypothesis test:
12 : Variance of population 1
22 : Variance of population 2
12/22 : Ratio of two variances
H0 : 12/22 = 1
HA : 12/22 > 1

Hypothesis test results:

Hence,

Hypotheses: Option A is correct.

f = 4

0.001 < P - value < 0.010

Conclusion: Option C is correct.

Ratio Num. DF Den. DF Sample Ratio F-Stat P-value 12/22 14 21 4 4 0.0022

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