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# Statistics and methodology - Statistics and Methodology Multiple Choice Questions

66:

Which of the following statement is/are true?

 A. A typical application is of putting the dealer distributor network on the network of the organisation for a direct interaction B. The communication is performed through three activities, viz., entry, transmission and delivery C. Message switching is an alternative to circuit switching communication D. All of the above Answer Report Discuss Option: D Explanation : Click on Discuss to view users comments. Write your comments here:
67:

Match the following

List-I (Types of Network Topology)   List-II (Connection)

(A) Bus                                                      1. Connected through one cable

(B) Star                                                     2. Connected through central system

(C) Ring                                                    3. Connected with cable layout

(D) LAN                                                     4. Within department

 A. (A) (B) (C) (D) 1    4    3    2 B. (A) (B) (C) (D) 3    4    1    2 C. (A) (B) (C) (D) 1    2    3    4 D. (A) (B) (C) (D) 1    3    2    4 Answer Report Discuss Option: C Explanation : Click on Discuss to view users comments. Write your comments here:
68:

Given

X = 0.85y, Y = 0.89x, σz = 3, find σy

 A. 3.07 B. 2.03 C. 4.06 D. 1.03 Answer Report Discuss Option: A Explanation : Regression coefficient of X and Y or bxy = r x σx/σy = 0.85 or 0.87 x 3/σy = 0.85 or 2.61/σy = 85 or 0.85 σy = 2.61 or σy = 2.61/0.85 = 3.07 Hence the answer is (a). Click on Discuss to view users comments. Write your comments here:
69:

The probability of a bomb hitting a target is 1/5. Two bombs are enough to destroy a bridge. If six bombs are aimed at the bridge, find the probability that the bridge is destroyed

 A. 0.79 B. 0.39 C. 0.16 D. 0.36 Answer Report Discuss Option: B Explanation : ‘P’ of hitting a bridge = 1/5 q= 1 - P or     1 - 1/5 = 4/5 n = 6, r = 1 Hence the answer is (b).   Click on Discuss to view users comments. Write your comments here:
70:

Twenty-one students took a management course examination. The sample variance is found to be 80. The teacher claims that based on his past experience the true variance has been at least 100. Does the sample result show that the population variance significantly less than 100?

 A. The variability is not significant B. Significant with +1 C. The variability is significant D. All of the above Answer Report Discuss Option: A Explanation : The value of X2 for 20 d.f. 5% level of significance 31.4. The variability is no significant. Hence the answer is (c). Click on Discuss to view users comments. Write your comments here: X