A researcher selected a sample of 50 residents from each of 3 different cities to determine if they were willing to participate in a medical experiment. At a=.05, test the claim that the proportions who will participate are equal

reisdents city 1 city 2 city 3

will participate 20 12 22

will not " 30 38 28

total 50 50 50

solutions:

a)there is not evidence to reject the claim that the proportions are equal because the test value 4.861<5.991

b)there is evidence tp reject the claim that the proportions are equal because the test value 12.592>1.042

c)there is evidence to reject the claim that the proportions are equal because the test value 5.991>.4861

d)there is evidence to reject the claim that the proportions are equal because the test value 5.991>1.042

which of the following assumptions is NOT made for the F test for comparing 3 or more means?

solutions:

a)the population from which the samles were obtained must be normally distributed

b)the samples must be independent of each other

c)the sample sizes must be equal

d)the variances of the population must be equal

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