BINDURA UNIVERSiTY OF SCIENCE EDUCATION
BSC HONS DEGREE IN COMPUTER SCIENCE DEGREE
RESEARCH METHODOLOGY
-CS2_0_6,
III
-
INSTRUCTION
TO CANDIDATES
Answer all questions.
Total marks are 100.
Question 1
a)
Suppose a consultant is brought in to see why a project went wrong at an organization. The
objective is to learn the truth about what happened in order to guard against a similar failure
in the future. The.consultant visits the organization and obtains from management a list of
key players in the project. He then interviews these people, and also interviews people that
are named by them. He asks all of them what went wrong. He then puts together a
composite picture (weighting some people's accounts more than others, based on his
judgment of the accuracy of their reports), and presents the result to management. Is this a
good methodology given the research objective?
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b) If you were planning to carry out a sample survey to determine the acceptance levels for
a new contraceptive method among currently married women, in a high density area of
Bindura, discuss the different precautions you would take to reduce the non-response
rate.
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_
Question 2
a) State the simple linear regression assumptions.
______________________
~[=5~]_i~------
b) An experiment was conducted to determine the extent to which the growth rate of a certain
fungus could affect the filling test tubes to which containing the same medium at the same
temperature with different insert gases. Three such experiments were performed for each of
six gases and the average growth rate was used as the response. The table below gives the
molecular weight (X) of each of the gases and the average growth rate (Y) in millimeters
per hour for the three tests.
Average growth rate (Y)
Molecular
4.85
5.0
4.48
21.2
4.27
29.2
4.08
40.9
3.56
84.3
3.21
132.3
Weight (X)
i)
Find the regression equation for the above data.
ii)
What would be the expected growth rate when the molecular
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weight of the gas is 6.0
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Question 3
Whenever
unprepared
students are given a test, their seating arrangements
seem to change, with the
students seating towards the back and those who are ~
ared at the front.
A
----------~~----------random sample of random sample of back sitters and front sitters was picked and their scores
from the test out of70 are given in the table below.
Back sits
32.1
21.3
21.1
26.7
28.1
31.7
22.9
Front sits
29.0
66.0
40.0
29.0
36.0
46.0
42.0
a) Test at 0.=0.05 whether there is any difference in the variability
20.9 28.1
in the marks of the
individuals depending on their sitting position.
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Question 4
a) Give anyone
disadvantage and one advantage of completely randomized designs.
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b) A psychologist was interested in whether different TV shows lead to more positive outlook
on life. People were split into four groups and then taken to a room to view a program. The
four groups saw: The Muppet show, Futurama , The news, No program. After the program
a blood sample was taken and serotonin levels were measured (remember more serotonin
means happier!).
The Muppet show
Futurama
BBC News
No Program
11
4
4
7
7
8
3
7
8
6
2
5
14
11
2
4
11
9
3
3
10
8
6
4
5
4
4
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i)
ii)
Write down the fixed effects model a completely randomized block design.
[3]
Construct an ANOV A table ANOV A to test the hypothesis that some TV shows make
people happier than others and make all the necess~
conclusions., _
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Question 5
a) What is a randomized block design?
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b) What are the advantages of a randomized block design over a completely randomized
design?
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c) A medical researcher was developing a new drug for relief of serve rare cases of hay
fever. In an experiment with 16 volunteers the amount of 2 active ingredients morphin
and methanine in the compound were varied at 4 levels each.
Methanine
Morphin
Low
Medium
High
Very High
Low
2.7
4.2
4.5
6.2
Medium
5.5
8.7
9.4
10.3
High
6.1
9.9
13.5
17.7
Very high
8.2
10.3
19.4
23.4
ii) State the model and assumptions used.
iii) Construct
[3]
an ANOVA table and make appropriate
conclusions
pairwise comparisons if necessary
iv) Find the estimates of 82
****************
,
at u=0.05 .Make
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821' ,82p
, 8\p
End ofPaper***************
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