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5 30 A concern to public health officials is whether a concentration of lead in...

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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 18 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 05 test

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