Our environment is very sensitive to the amount of ozone in the upper atmosphere. The level of ozone normally found is 7.0parts/million (ppm). A researcher believes that the current ozone level is at an insufficient level. The mean of 27 samples is 6.9 ppm with a variance of 1.00. Does the data support the claim at the 0.05 level? Assume the population distribution is approximately normal. Step 1 of 5 :   State the null and alternative hypotheses.

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