# Statistics and methodology - Statistics and Methodology Multiple Choice Questions

91:

Given

Σdxdy = 186, Σdx = 11, Σdy = 7, N = 10, Σd2x = 215, Σd2y = 163.

Find out correlation

 A. + 0.72 B. + 0.99 C. + 0.96 D. Answer Report Discuss Option: B Explanation : Hence the answers (b). Click on Discuss to view users comments. Write your comments here:
92:

A machine on the average produces 5% defective articles. What are the mean and standard deviation in sets of 100 articles?

 A. 5.3 B. 3.4 C. 2.2 D. 3.3 Answer Report Discuss Option: C Explanation : Mean = np = 100 x 0.05 = 5 σ = √(npq) = √(0.05 x 0.95 x 100) = 2.2 Hence the answer is (c). Click on Discuss to view users comments. Write your comments here:
93:

If the proportion of defective in a bulk is 4%, find the probability of not more than 2 defectives in a sample of 10, it is known that e-4 = 6703

 A. 99.2% B. 3.06% C. 9.36% D. 4.02% Answer Report Discuss Option: A Explanation : Probability of not more than 2 defectives = 0.6703 + 0.26812 + 0.053624 = 0.992044 x 100 = 99.2% Hence the answer is (a). Click on Discuss to view users comments. Write your comments here:
94:

Management science model consists

 A. Return on investment analysis B. Break-even analysis model C. Budgeting models D. All of the above Answer Report Discuss Option: D Explanation : Click on Discuss to view users comments. Write your comments here:
95:

t is

 A. Small test B. Correlation C. Large test D. Regression analysis Answer Report Discuss Option: A Explanation : Click on Discuss to view users comments. Write your comments here: