Arsenic is a compound that occurs naturally in very low

Last updated: 7/13/2022

Arsenic is a compound that occurs naturally in very low concentrations. Arsenic blood concentrations in healthy individuals are normally distributed, with mean u 3.2 micrograms per deciliter (μg/dl) and standard deviation = 1.5 (μg/dl). Some areas are known to have naturally elevated concentrations of arsenic in the ground and water supplies. We take a random sample of adults residing in a high-arsenic area and ask whether the data provide good evidence that the mean blood arsenic concentration in this population is elevated compared with the 3.2 µg/dl mean of the population of healthy individuals. Define the parameter examined and select the appropriate null and alternative hypotheses. Ho: μ = 3.2 μg/dl; Ha: μ> 3.2 µg/dl None of the options are correct. Ho: μ = 3.2 µg/dl; Ha: μ< 3.2 μg/dl Ho: H=3.2 μg/dl; Ha: ## 3.2 μg/dl