According to Kaiser Family Foundation survey in 2011 and 2010, the average premium for employer-sponsored health insurance for family coverage was $15,073 in 2011 and $13,770 in 2010 (USA TODAY, September 29, 2011). Suppose that these averages were based on random samples of 250 and 200 employees who had such employer-sponsored health insurance plans for 2011 and 2010, respectively. Further assume that the population standard deviations for 2011 and 2010 were $2160 and $1990, respectively.

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A: Givensample size(n)=49Mean(x)=5.1standard deviation(s)=1.2significance level(α)=0.01

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A: Given For males, μ=4.296σ=0.907 For females μ=3.764σ=0.866

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A: According to the given information in this question We need to find the z score

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Q: 1. The standard deviation provides an overall measurement of how much participants' scores differ…

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Q: One year Terry had the lowest ERA (earned-run average, mean number of runs yielded per nine innings…

A: Answer Given Terry:Mean =4.364Standard deviation =0.639Karen:Mean =3.801Standard deviation =0.959