Kizspy | Question: 111
(Choose 1 answer)
(See picture)
Α. (-3.684, -2.116)
Β. (-3.556, -2.244)
C. (-4.002, -2.778)
D. (-2.897, -1.995)
E. None of the other choices is correct
Two different formulations of an oxygenated motor fuel are being tested to study their road octane numbers. The variance of road octane number for formulation 1 is σι 1.5, and for formulation 2 it is \sigma_{2}^{2}=1.2 . Two random sam-ples of size n_{1}=15 and n_{2}=20 are tested, and the mean road octane numbers observed are \overline{x}_{1}=89.6 and \overline{x}_{2}=92.5 .
Construct a 95% confidence interval for the difference in the means of two populations.Let Z0.025=1.96; Z0.05 = 1.64
