Our environment is very sensitive to the amount of ozone in the upper atmosphere. The level of ozone normally found is 5.0 parts/million (ppm). A researcher believes that the current ozone level is not at a normal level. The mean of 16 samples is 4.8 ppm with a variance of 0.25. Assume the population is normally distributed. A level of significance of 0.1 will be used. State the null and alternative hypotheses
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