The nicotine content in cigarettes of a certain brand is normally distributed with mean (in milligrams) / and standard deviation o = 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 15 cigarettes of this brand. The sample yields an average of 1.4 mg of nicotine. Conduct a test using a significance level of a = 0.01. (rounded to 2 decimals) (a) The test statistic (b) The critical value, z* = (c) The final conclusion is O A. The nicotine content is probably higher than advertised. O B. There is not sufficient evidence to show that the ad is misleading