To help consumers assess the risks they are taking, the Food and Drug Administration (FDA) publishes the amount of nicotine found in all commercial brands of cigarettes. A new cigarette has recently been marketed. The FDA tests on this cigarette yielded mean nicotine content of 24.3 milligrams and standard deviation of 2.1 milligrams for a sample of cigarettes. Construct a 99 confidence interval for the mean nicotine content of this brand of cigarette.
A) 24.3 2.413 B) 24.3 2.349 C) 24.3 2.491 D) 24.3 2.275
Question 2
A marketing research company is estimating the average total compensation of CEOs in the service industry. Data were randomly collected from 18 CEOs and the 99 confidence interval for the mean was calculated to be (2,181,260, 5,836,180 ) What would happen to the confidence interval if the confidence level were changed to 98?
A) The interval would get narrower.
B) The interval would get wider.
C) It is impossible to tell until the 98 interval is constructed.
D) There would be no change in the width of the interval.
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