A consumer advocacy group compares the amount of nicotine in two brands of cigarettes. A sample of 64 cigarettes from Brand A has an average of 1.95 mg with a standard deviation of 0.24 mg. A sample of 81 cigarettes from Brand B has an average of 1.85 mg and a standard deviation of 0.22. Suppose you want to estimate how much more nicotine is in Brand A cigarettes in general using a 90% confidence interval.
1. The facts of this problem are:
mu(A)=1.95;mu(B)=1.85;sigma(A)=0.24 ;sigma(B)=0.22;n(A)=64;n(B)=81
x-bar(A)=1.95;x-bar(B)=1.85;s(A)=0. 24;s(B)=0.22;n(A)=64;n(81)=38
x-bar(A)=0.24;x-bar(B)=0.22;s(A)=1. 95;s(B)=1.85;n(A)=64;n(B)=81
2. What is the correct table to use for this problem?
Table F because it is a chi-square problem
Table A because this is a proportion problem
Table D because sigma is not known