Question 6 of 20 : Select the best answer for the question. 6. When a = .10, what is the rejection region that should be used to test Ho:02 =0? against Ho: 02 > 03? Assume v, = 10 and V2 = 12. O A. F > 2.78 O B. F > 2.04 O C. F > 1.74 O D. F > 2.33Question 5 of 20 : Select the best answer for the question. 5. Civil engineers use regression analysis to estimate repair and replacement costs of different types of piping. The Independent variable in their analysis. it, is the diameter of the pipe [in millimeters}. Data for a sample of 13 different pipe sizes is shown in the table: 6.53 6.9? 7.39 7.61 7.78 7.92 8.20 8.42 3.60 8.9? 9.31 9.47 9.72 -00100125150200250300350400450500600700 Find the least squares line relating ratio of repair to replacement cost (y) to pipe diameter {x}. O A. y .. 6.33 + .0230): O B. in: 0.07+.0040x O c. f- 6.91+.0122x O D. )7 .. 6.18 + .0013: Question 4 of 20 : Select the best answer for the question. 4. In testing the difference between two population means using two independent samples, you use the pooled variance in estimating the standard error of the sampling distribution of the sample mean difference it )_r2 if the O A. populations are at least normally distributed with equal variances. O B. populations are nonnormal with unequal variances. O C. sample sizes are both large. 0 D. populations are normal