February 19, 2017

Homework Help: Stastics

Posted by Roger on Sunday, November 28, 2010 at 11:30am.

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 28.8 milligrams and standard deviation of 2.1 milligrams for a sample of cigarettes. Construct a 90% confidence interval for the mean nicotine content of this brand of cigarette.
Choose one answer. A. 28.8 ± 1.361
B. 28.8 ± 1.381
C. 28.8 ± 1.283
D. 28.8 ± 1.302

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