The nicotine content in cigarettes of a certain brand is normally distributed with mean (in milligrams) ? and standard deviation ?=0.1. The brand advertises that the mean nicotine content of their cigarettes is 1.5 mg. Now, suppose a reporter wants to test whether the mean nicotine content is actually higher than advertised. He takes measurements from a random sample of 10 cigarettes of this brand. The sample yields an average of 1.55 mg of nicotine. Conduct a test using a significance level of ?=0.05. (a) The test statistic is: (b) The critical value is: (c) The final conclusion is A. There is not sufficient evidence to show that the ad is misleading. B. The nicotine content is probably higher than advertised.

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The nicotine content in cigarettes of a certain brand is normally distributed with mean (in milligrams) ? and standard deviation ?=0.1. The brand advertises that the mean nicotine content of their cigarettes is 1.5 mg. Now, suppose a reporter wants to test whether the mean nicotine content is actually higher than advertised. He takes measurements from a random sample of 10 cigarettes of this brand. The sample yields an average of 1.55 mg of nicotine. Conduct a test using a significance level of ?=0.05.

(a) The test statistic is:

(b) The critical value is:

(c) The final conclusion is

A. There is not sufficient evidence to show that the ad is misleading.
B. The nicotine content is probably higher than advertised.

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