2.Arsenic is a compound that occurs naturally in very low concentrations. Arsenic blood concentrations in healthy individuals are Normally distributed, with a mean of 3.2 mg/dl and a standard deviation of 1.5 mg/dl. A researcher believes that one area of the United States has naturally elevated arsenic levels in the ground and water supplies. An SRS of 25 individuals in this area found a sample mean arsenic level of 3.75 mg/dl. What are the null and alternative hypotheses for this study?

The null hypothesis                

The alternative hypothesis      

Step-by-step explanation:

From the question we are told that

  The mean is  

   The standard deviation is

   The sample size is  n = 25

    The sample mean is  

Generally

   The null hypothesis is : That the mean of the  Arsenic blood concentrations in healthy individuals is

i.e

The null hypothesis  

    The alternative hypothesis is : That the mean of the  Arsenic blood concentrations in healthy individuals is greater than  

The alternative hypothesis      

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step-by-step explanation:

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