Question

Our environment is very sensitive to the amount of ozone in the upper atmosphere. The level of ozone normally found is 4.4 parts/million (ppm). A researcher believes that the current ozone level is not at the normal level. The mean of 9 samples is 3.9 ppm with a standard deviation of 1.2 . Does the data support the claim at the 0.1 level? Assume the population distribution is approximately normal. Step 4 of 5 : Determine the decision rule for rejecting the null hypothesis. Round your answer to three decimal places. Step 5: reject or fail to reject the hypothesis?

Answer 1

Solution:

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