# PSM 823 – OPERATIONS RESEARCH AND STATISTICS (2014)

NATIONAL OPEN UNIVERSITY OF NIGERIA

14/16, AHMADU BELLO WAY, VICTORIA ISLAND, LAGOS

SCHOOL OF MANAGEMENT SCIENCES

MARCH 2014 EXAMINATION

Course Code: PSM 823                                                                         Credit Units: 2

Course Title: OPERATIONS RESEARCH AND STATISTICS

Time Allowed: 2 Hours

Instructions:

1. Attempt Question 1 and any other two (2) Questions.
2. Question 1 is compulsory and carries 30 marks while the other 2 Questions carry 20 marks

each.

1a.Define statistics

1b.Explain how to write a good questionnaire

1c. Distinguish between the following and give two examples of each:

i. Numeric and non numeric data

ii. Discrete and continous data

iii. Ordinal and continous data

2a. Explain tyes of sampling.

2b. In a survey of 50 PG students of the Charted Institute of Shipping where the ratio of

female to male is 10:40, draw a sample of 15 students using stratified sampling method.

1. The number of births recorded in each of the 50 maternity centres, in Surulere Local

Government in October 2002, is as follows.

Table

 50 99 81 86 69 85 93 63 92 65 77 74 76 71 90 74 81 94 67 75 95 81 68 105 99 68 75 75 76 73 79 74 80 69 74 62 74 80 79 68 79 75 75 71 83 75 80 85 81 62

Required

Construct a frequency distribution table using the interval-45-54, 55-64, etc.

1. Discuss the following:

i. skewness and kurtosis

ii. Axiomatic Probability

iii. Permutation and Combination

iv. Sample space

v. Independent event

5a. What are the Characteristics of a binomial random variable?

5b. List seven (7) typical examples of random variable for which Poisson distribution

provides good model.

5c. Procedure for Hypothesis Testing.

You can get the exam summary answers for this course from 08039407882

Check the sample below