1. Describe the terms “ Unit of analysis”, “Characteristics
of Interest” and “Decision-Making Unit”. Why
is there confusion between the first two?
2. What is stratified sampling? How allocation of sample to
different strata is done? Discuss the benefits of such an approach.
3. What is the objective of doing factor analysis? Explain the
terms involved in Factor Analysis? How many factors one need
to take.
4 . A teacher wishes to test three different teaching methods
I, II, III. To do this, the teacher chooses at random three
groups of five students each and teaches each group by a different
method. The same examination is then given to all the students
and the marks obtained are given below. Determine at α =0.05
significance level whether there is difference between the teaching
methods. Use Kruskal-Wallis test.
| Method I | 78 | 62 | 71 | 58 | 73 |
| Method II | 76 | 85 | 77 | 90 | 87 |
| Method III | 74 | 79 | 60 | 75 | 80 |
5. Discuss the major elements of communication dimensions that are relevant to a presentation.