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Our environment is very sensitive to the amount of ozone in the upper atmosphere. The level...

Our environment is very sensitive to the amount of ozone in the upper atmosphere. The level of ozone normally found is 7.7 parts/million (ppm). A researcher believes that the current ozone level is not at the normal level. The mean of 21 samples is 7.4 ppm with a variance of 1.21. Does the data support the claim at the 0.05 level? Assume the population distribution is approximately normal.

Step 2 of 5 :

Find the value of the test statistic. Round your answer to three decimal places.

Step 3 of 5:

Is this a one tail or two tailed test.

Math   Statistics-And-Probability   
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