# Statistics and methodology - Statistics and Methodology Multiple Choice Questions

101:

Given

Σdxdy = 2350, Σd2x = 8250, Σd2y = 724, then r will be

 A. + 0.92 B. +0.96 C. +0.36 D. +0.76 Answer Report Discuss Option: B Explanation : Hence the answer is (b) Click on Discuss to view users comments. Write your comments here:
102:

A random sample of 15 pairs of values of X and Y from a normal population gives a correlation coefficient of + 0.6. Is the correlation in the population significant?

 A. r is significant with -1 B. r is significant with +1 C. r is significant D. r is not significant Answer Report Discuss Option: C Explanation : N = 15, r = 0.6 Z = 1.1513 log 1 + r/1 - r = 1.1513 log 1 + 0.6/1 - 0.6 = 1.1513 log 4 = 1.1513 x 0.6021 = 0.6932 S.E.2 = 1/√(N - 3) = 1√(15 - 3) = 1√12 = 1/3.464 = 0.29 Z/(S.E.)2 = 0.6932/0.29 =2.39 > 1.96 Hence 'r' is significant at 5% level of significance. The answer is (c). Click on Discuss to view users comments. Write your comments here:
103:

What is the chance of drawing a queen in a draw from a pack of 52 cards?

 A. 1/9 B. 1/13 C. 1/14 D. 1/12 Answer Report Discuss Option: B Explanation : Total number of cases that can happen = 52 No. of favourable cases = No. of queens in a pack or        52= 4 The probability (P) will be - P = 4/52 = 13 Hence the answer is (b). Click on Discuss to view users comments. Write your comments here:
104:

A company makes electric toys. The probability that an electric toy is defective is 0.01. What is the probability that a shipment of 300 toys will contain exactly 5 defectives?

 A. 0.1 B. 3.4 C. 0.2 D. 0.36 Answer Report Discuss Option: A Explanation : Hence the answer is (a). Click on Discuss to view users comments. Write your comments here:
105:

If the stock level ≤ then recorder level, then draw a purchase order of the quantity equal to the

 A. EOQ B. CPM C. PERT D. BEP Answer Report Discuss Option: A Explanation : Click on Discuss to view users comments. Write your comments here: