14. Certain industrial emissions should not exceed 2.5 ppm, but you believe some companies may be exceeding this limit. To test you randomly take a random sample of 12 air tests and found a sample mean of 2.92 ppm with a sample standard deviation of 0.60 ppm. Use $\alpha$=0.01 to test if the mean emission exceeds 2.5 ppm. Assume emissions are normally distributed. (a) Write the null and alternative hypotheses. (b) What is the value of the test statistic? (c) Give the critical value and make a conclusion. (d) Give the associated P-value and make a conclusion.
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5 ppm. The alternative hypothesis is that the mean emission is greater than 2.5 ppm. Show more…
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