1. Describe the terms “Unit of analysis”, “Characteristics of Interest” and “Decision-Making Unit”. Why is there confusion between the first two?
2. Given the technical advantages of probability sampling over non-probability sampling, why would anyone choose the latter? Give some practical reasons for using the less precise methods.
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 determine whether his brightest students (those making the best grades) tend to turn in their tests earlier (because they can recall the material faster) or later (because they take longer to write down all they know) than the others in the class. For a particular test, he observes that the students make the following grades in order of turning their tests in:
Order |
Grades |
|||||||||
1-10 |
94 |
70 |
85 |
89 |
92 |
98 |
63 |
88 |
74 |
85 |
11-20 |
69 |
90 |
57 |
86 |
79 |
72 |
80 |
93 |
66 |
74 |
21-30 |
50 |
55 |
47 |
59 |
68 |
63 |
89 |
51 |
90 |
88 |
If the teacher counts those making a grade of 90 and above as his brightest students, then at a 5 percent level of significance, can he conclude the brightest student turned their tests in randomly?
5. Discuss the major elements of communication dimensions that are relevant to a presentation.