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kotegsom [21]
3 years ago
14

2. Arsenic is a compound that occurs naturally in very low concentrations. Arsenic blood concentrations in healthy individuals a

re 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?
Mathematics
1 answer:
TiliK225 [7]3 years ago
3 0

Answer:

The null hypothesis                 H_o :  \mu = 3.2 \ mg/dl

The alternative hypothesis      H_a :  \mu > 3.2 \ mg/dl

Step-by-step explanation:

From the question we are told that

  The mean is  \mu = 3.2 \  mg/dl

   The standard deviation is \sigma =  1.5 mg/dl

   The sample size is  n = 25

    The sample mean is  \= x = 3.75 \  mg /dl

Generally

   The null hypothesis is : That the mean of the  Arsenic blood concentrations in healthy individuals is \mu = 3.2 \  mg/dl

i.e

The null hypothesis  H_o :  \mu = 3.2 \ mg/dl

    The alternative hypothesis is : That the mean of the  Arsenic blood concentrations in healthy individuals is greater than  \mu = 3.2 \  mg/dl

The alternative hypothesis      H_a :  \mu > 3.2 \ mg/dl

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