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5.30 A concern to public health officials is whether a concentration of lead in the paint...

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Basic Math

5.30 A concern to public health officials is whether aconcentration of lead in the paint of older
homes may have an effect on the muscular development of youngchildren. In order to evaluate
this phenomenon, a researcher exposed 90 newly born mice to paintcontaining a specified
amount of lead. The number of Type 2 fibers in the skeletal musclewas determined 6 weeks
after exposure. The mean number of Type 2 fibers in the skeletalmuscles of normal mice of this
age is 21.7. The n=90 mice yielded y(mean)=8.8, s=15.3. Is theresignificant evidence in the data
to support the hypothesis that the mean number of Type 2 fibers isdifferent from 21.7 using an
alpha = .05 test?

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