NATIONAL OPEN UNIVERSITY OF NIGERIA
91, CADASTRAL ZONE, UNIVERSITY VILLAGE, JABI, ABUJA
FACULTY OF AGRICULTURAL SCIENCES
DEPARTMENT OF CROP AND SOIL SCIENCES
2020_2 EXAMINATION 1234
COURSE CODE: AGR 302
COURSE TITLE: AGRICULTURAL STATISTICS AND DATA PROCESSING
INSTRUCTIONS: ANSWER FOUR (4) QUESTIONS. QUESTION 1 IS COMPULSORY
(25 MARKS) AND ANY OTHER THREE (3) (15 MARKS EACH)
1 Fifteen goats were randomly allocated to three (3) groups with three (3) different
levels of protein in their diet. This experiment was replicated five (5) times.
Level 1 Level 2 Level 3
6.0 8.0 10.0
5.2 6.5 8.20
5.5 8.3 8.0
4.5 9.0 7.2
4.8 6.8 9.3
1. 1Draw an ANOVA table and state all the mean squares and their degrees of
freedom. (21 marks)
1b. Describe the following sampling methods:
i. Random sampling
ii. Stratified sampling (4 marks)2 Simply differentiate between Simple and Multiple Correlation (5 marks)
b. Briefly describe any five (5) types of simple correlation or simple regression (10
marks)
3 Discuss these Essential in Steps Experimentation under the following headings
a. Definitions of Objectives
b. Choice of Treatments
c. Replication
d. Literature review
e. Field experimentation practices (15 marks)
4 What is ANCOVA (4 marks)
b. When is ANCOVA used? (11 marks)
5 State five (5) properties of a Normal Curve (5 marks)
b. Solve the following:
i. 15!
ii. 10!
iii. 7! (6 marks)
c. Describe Subjective probability (4 marks)
6 Describe a factorial experiment (2 marks)
b. Explain Type I and Type II error (10 marks)
c. State three (3) assumptions of Analysis of Variance (ANOVA) (3 marks)
7 Define Central Tendency (3 marks)
b. Discuss the following
i. Mean ii. Median iii. Mode (12 marks)
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