Multiple choices 40/50
Answer (Choose 1 answer)
(See picture)
A. (-3.684, -2.116)
B. (-4.002, -2.778)
C. (-3.556, -2.244)
D. (-2.897, -1.995)
E. None of the other choices is correct
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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 a = 1.5, and for formulation 2 it is \sigma_{2}^{2}=1.2 Two random sam-ples of size n_{1}=15 and n_{\gamma}=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 tz0.025=1.96 , Z0.05 = 1.64
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