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Agri 571: Research Designs And Data Analysis Question Paper

Agri 571: Research Designs And Data Analysis

Course:Master Of Science In Agricultural & Rural Development

Institution: Kenya Methodist University question papers

Exam Year:2012

KENYA METHODIST UNIVERSITY
END OF 1''st ''TRIMESTER 2012 EXAMINATIONS
FACULTY : SCIENCE & TECHNOLOGY
DEPARTMENT : AGRICULTURE AND NATURAL RESOURCES
UNIT CODE : AGRI 571
UNIT TITLE : RESEARCH DESIGN AND DATA ANALYSIS
TIME : 3 HOURS

INSTRUCTIONS
Answer questions one and any other two questions.
Question One (30 Marks)
Explain the relationship between ’a population’ and ’a sample’ in statistics.
(6 Marks)
Explain the importance of replication in a field experiment.
(6 Marks)
What is a hypothesis in statistics?
(4 Marks)
What is the main purpose of hypothesis testing?
(4 Marks)
Complete the sample ANOVA table below.
(10 Marks)

Sov df ss ms F P.value
Factor A 2 162.50 - - 0.000
Factor B 2 68.31 - - 0.001
AXB - 0.44 - - 0.571
Error - - - -
Total 27 350.28
Do you ’reject’ or ’fail to reject’ the hull hypothesis for factors A and B?
What is your conclusion on the treatment means of factors A and B?
Is there a need for post hoc analysis?
Question Two
A civil service effiency expert developed a test measuring job satisfaction of civil service clerks. The following information was obtained from a random sample of 10 clerks.
X 48 92 32 56 20 72 16 56 76 80
Y 13 2 14 10 14 6 17 8 3 7
Where X is the job satisfaction index and Y is the number of days absent from work in 1(one) year:
Draw a scatter diagram for the data above.
Estimate the correlation coefficient V and comment on it.
Estimate the prediction equation in form of Y=a +bx
Estimate the number of days (y) a clerk is absent in 1 year if the job satisfaction index(x) is 60.
(15 Marks)
Question Three
What is the purpose of blocks in a field experiment?
(4 Marks)
A researcher designed an experiment to compare the yield potentials of 3 maize varieties at 3 fertilizer levels. The experiment was conducted in 3 blocks :
Illustrate the treatment combinations used in this experiment.
Show the plot layout the researcher could have used in this experiment.
Complete the ANOVA table below and answer (iv), (v) and (vi).
SOV df SS MS F P. value
Blocks - 26.41 - - 0.351
Maize Var(a) - 184.64 - - 0.001
Fert Level (B) - 245.52 - - 0.000
A X B - 67.97 - - 0.43
Error - - - -
Total - 583.46 - -
Were the blocks ’effective’ or ’not effective’? Explain.
Do you ’reject’ or ’fail to reject’ the null hypothesis for factors A and B?
Explain the interaction effects of A and B.
(11 Marks)
Question Four
Explain the difference between a Randomized Complete Blocks Design (RCBD) and a Latin Square (LS) Design.
(5 Marks)

Explain the factors that determine the number of replication in an experiment.
(5 Marks)

Explain the factors that determine the size of the plots in an experiment.
(5 Marks)

Agri 571: Research Designs And Data Analysis Question Paper

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