Explanation of Solution It is given in the question that Arsenic blood concentrations in healthy individuals are normally distributed with mean μ = 3.2 micro per deciliter and standard deviation = 1.5µg/dl. And they have taken a sample of adults and asked whether the data provide good evidence that the mean blood arsenic concentration in this population is elevated compared with the 3.2µg/dl mea of the population of healthy individuals. Thus, the parameter defined in this scenario is μ, the mean blood arsenic concentration in this population. And the null and alternative hypotheses is defined by: Họ : p = 3.2ugldl Ha 3.2μg/dl
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the solution is wrong. the alternative hypothesis should be mu > 3.2
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