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

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

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milcah answered 1 year ago
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