1. Discuss the various experimental designs as powerful tools to study the cause and effect relationships amongst variables in research.
2. Explain Stratified Random Sampling. Describe proportional allocation and optimum allocation with the help of an example.
3. A physical instructor claims that a particular exercise when done continuously for 7 days, reduces body weight at least by 3.5kg. Five overweight girls did the exercise for 7 days and their body weights were found as under:
| Girls | 1 | 2 | 3 | 4 | 5 |
| Weight before exercise | 70 | 72 | 75 | 71 | 78 |
| Weight after exercise | 66 | 70 | 72 | 66 | 72 |
Making use of the sign test, verify the claim at α = 0.05 that the exercise reduces weight by at least 3.5kg.
4. Explain the different parts of a typical research report. Also prepare a sample Index page of such report.
5. Write short notes on:
i) Dependent and Independent variable
ii) Copy Reading
iii) Discriminant Analysis.
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