Kizspy | Question: 58
(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 σ} = 1.5, and for formulation 2 it is 3 = 1.2. Two random_samples of size n₁ = 15 and n₂ = 20 are tested, and the mean road octane numbers observed are X₁ = 89.6 and 2 92.5.
Construct a 90% confidence interval for the difference in the means of two populations.
Let z0.025 1.96, 20.05 1.64
