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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 4.1 parts/million (ppm). A researcher believes that the current ozone level is not at a normal level. The mean of 12 samples is 3.7 ppm with a variance of 0.81. Assume the population is normally distributed. A level of significance of 0.05 will be used. State the null and alternative hypotheses.

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