LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034
M.Sc. DEGREE EXAMINATION – BIO MED. INSTRU. SCIENCE
THIRD SEMESTER – NOVEMBER 2010
BI 3813 - BIOSTATISTICS
Date : 03-11-10
Time : 9:00 - 12:00
Dept. No.
Max. : 100 Marks
Section-A
Answer all the questions:
10x2=20
1. Differentiate quantitative from qualitative variables.
2. Find the median of the following number:
88,72,33,29,70,86,54,91,61,57.
3. Calculate β1 and β2 if μ1=0, μ2=500, μ3=0 and μ4=0.
4. Write the expression to calculate ` r’ values when ranks are repeated.
5. Prepare a sctter plot and report the correlation
Methodii
132
134
132
140
150
Method i
130
138
144
146
148
The above are pressure reading of 2 different methods in 5 different patients.
6. Estimate a μ of 95% confidence when sample mean =50 and S.E= 0.5.
7. Define and write the expression of null hypothesis.
8. Expand the acronymn ANOVA and mention its types.
9. In Excel which facility can be used to create a wide variety of Charts and what is the formula for
calculation of Sum?
10. Write the names of statistical software tools other than Ms-Excel (Any 4).
Section-B
Answer any four questions:
4x10=40
11. What do you mean by tabulation of Data. Elaborate on general structure of Table and its Types.
12. The following Data:(X- Yield as fruits, Y- no. of trees)
X
100
150
80
200
250
180
y
24
26
16
20
6
30
Calculate the mean and S.D. Also draw a cummulative frequency polygon and interpret.
1
13. Calculate the coefficient of correlation between X and Y for the following
X
1
3
4
5
7
8
10
Y
2
6
8
10
14
16
20
And also derive Y on X regression equation.
14. What is T distribution? What are its various uses. Apply‘t’ test for a sample of n=18 yield a mean of
10.8 and a S.D=3cm.Can the sample be regarded as a random one from a population of mean 9.8cm?
15. Enumerate the variation of rank correlation formula along with their conditions. Write short notes on
i) scatter plots ii) correlographs.
16. The given data:
Class interval
15-25
Frequency
4
25-35
35-45
11
19
45-55
55-65
14
65-75
0
2
Calculate the mean, S.D. and Quartile deviation.
Section-C
Answer any two questions:
2x20=40
17. Write in detail the role of diagrams and graphs in descriptive statistics.
18. What is Chi Square test? Explain its application in biology. Test whether the prevalence of carriers
of Filaria is associated with sex.
SEX
No. of carriers No.of non-carriers
Total
Male
78
412
490
Female
52
553
610
19. The following data gives the no. of colonies in 12 petriplates of three microbes under different
carbon source:A
B
C
25
20
24
22
17
26
24
16
30
21
19
20
Analyze the variance in no. of colonies under the influence of different carbon source.
20. Elaborate the following
a. Operating system
b. High level programming language
c. Source programme and object programme
d. Salient features of Ms-Excel and its functions.
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