NATIONAL OPEN UNIVERSITY OF NIGERIA

UNIVERSITY VILLAGE, PLOT 91, CASDASTRAL ZONE, NNAMDI AZIKIWE EXPRESS WAY, JABI, ABUJA.
FACULTY OF AGRICULTURAL SCIENCE
JUNE/JULY 2013 EXAMINATION

COURSE CODE: AEM772

COURSE TITLE: RESEARCH METHODS AND SOCIAL STATISTICS

TIME ALLOWED: 3hrs

INSTRUCTION: ANSWER 5 QESTIONS ONLY. ALL QUESTIONS CARRY EQUAL MARKS

1a.  List the basic principles of  farming system research  ( 5 marks)

1b. Discuss fully any three (3) of the principles mentioned in 1a above (15 marks)

2a. What are the criteria to consider in developing a theory (4marks)

2b. Highlight the relevance of theory in the conduct of research (10 marks)

2c. Explain the following terms (a) Variables (b) indicators     (6marks)

3a. Define the following terms

1. Critical Region
2.  Type 1 Error (α)
3.  Type 2 Error (β)
4. Level of significance
5.  Power of a test          (10marks)

3b. Differentiate between the Mean, Median and Mode (3marks).

3c. Given the following set of data, determine the Mean, Median and Mode.

      25, 30, 25, 38, 42, 39, 68, 11, 11, 11, 25, 28, 25, 38, 39, 30, 38, 42, 25, 68, 42.

4a. Explain the guidelines to follow when formulating questions in a questionnaire (15     marks).

4b. Briefly discuss the objectives of adoptive research (5marks).

5a. What are the main features of secondary data sources? (6Marks).

5b. Differentiate between private and public sources of data (6Marks).

5c. Fill the black space by putting the correct term for each of the definitions below. (8Marks)

6.  The data below represent the age of teachers and the number of children they have. Draw a scatter diagramme of the information presented and give your conclusion on the relationship.

7. The data below gives the per capita income (X) of some countries and expenditure on   education per student (Y). Predict Y when X = 4000