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. Ninety (90) mice yielded mean and standard deviation values of Type 2 fibers in their muscles as 18.8 and 15.3, respectively. a. Please calculate the level of significance of statistical test. b. 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 α = 0.05 test?
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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 co