A scientist estimates that the mean nitrogen dioxide level in a city is greater than 25 parts per billion. To test this estimate, you determine the nitrogen dioxide levels for 31 randomly selected days. The results (in parts per billion) are listed to the right. Assume that the population standard deviation is 8. At 0.09, can you support the scientist's estimate?
14 28 39 15 14 19 31 41 18 29 43 18 27 18 36 40 17 36 22 36 25 17 20 36 22 33 29 23
Find the critical value and identify the rejection region?
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