The nicotine content in cigarettes of a certain brand is normally distributed with mean (in milligrams) μμ and standard deviation σ=0.1σ=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 SRS of 10 cigarettes of this brand. The sample yields an average of 1.45 mg of nicotine. Conduct a test using a significance level of α=0.01α=0.01. (a) The test statistic (b) The critical value, z* = (Hint: The critical value should be one of the following values: -2.33, -1.645, 1.645, 2.33) (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.
The nicotine content in cigarettes of a certain brand is
(a) The test statistic
(b) The critical value, z* = (Hint: The critical value should be one of the following values: -2.33, -1.645, 1.645, 2.33)
(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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