Kizspy | Question: 45
(Choose 1 answer)
(See picture)
Α. (0.627, 1.613)
Β. (0.789, 1.449)
C. (0.742, 1.498)
D. (0.622, 1.618)
E. None of the other choices is correct
The diameter of steel rods manufactured on two different extrusion machines is being investigated. Two random samples of sizes n_{1}=12 and n_{2}=10 are selected, and the sample means and sample variances are \overline{x}_{1}=9.25 s_{1}^{2}=0.4, \overline{x}_{2}=8.13 and s_{2}^{2}=0.5 Assume that both populations are normally distributed with the same variance. Find a 90% two-sided confidence interval for the difference in the two population means.
Let 0.05 = 1.645, 0.1 = 1.281, 0.05, 20 = 1.725, 10.1,20 = 1.325
