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:
- Attempt Question 1 and any other two (2) Questions.
- 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.
- 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.
- 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
