# MS 8 IGNOU MBA Assignment July – Dec 2013

1. “Statistical unit is necessary not only for the collection of data, but also for the interpretation and presentation”. Explain the statement.

2. Find the standard deviation and coefficient of skewness for the following distribution

 Variable 0-5 5-10 10-15 15-20 20-25 25-30 30-35 35-40 Frequency 2 5 7 13 21 16 8 3

3. A salesman has a 60% chance of making a sale to any one customer. The behaviour of successive customers is independent. If two customers A and B enter, what is the probability that the salesman will make a sale to A or B.

4. To verify whether a course in Research Methodology improved performance, a similar test was given to 12 participants before and after the course. The original marks and after the course marks are given below:

 Original Marks 44 40 61 52 32 44 70 41 67 72 53 72 Marks after the course 53 38 69 57 46 39 73 48 73 74 60 78

Was the course useful? Consider these 12 participants as a sample from a population.

5. Write short notes on

a) Bernoulli Trials
b) Standard Normal distribution
c) Central Limit theorem