LOYOLA COLLEGE (AUTONOMOUS), CHENNAI600 034.
M.Sc. DEGREE EXAMINATION  ZOOLOGY
SECOND SEMESTER  APRIL 2003
ZO 2803 / Z 825 BIOSTATISTICS
24.04.2003
1.00  4.00
Max: 100 Marks
PART  A
(10  2 = 20 Marks)
Answer ALL questions.
01.
02.
03.
04.
05.
06.
07.
08.
09.
10.
Differentiate between random and non random sampling.
Define range. How is it estimated?
What are the parameters of binomial distribution?
What is coefficient of variance?
Differenciate Hypothesis and Null Hypothesis.
Define the terms Mean, mode and median.
Explain methods of collecting secondary data?
Define Poisson’s distribution.
What are Cartograms and Pictograms?
What is standard deviation and standard error?
PART  B
Answer any FOUR of the following
(4  10 = 40 Marks)
11. In a distribution, skewness and kurtosis of data play a vital role.  Justify.
12. Explain the structure of a ‘Table’ and its requirements.
13. a) Draw a pie diagram of the following data and comment on it.
Organisms
Water bugs and insects
Paramecium
Earthworms
Frogs
Number seen in water sample
270
128
13
4
b) Pi e is a significant tool in diagramatic representation Justify.
14. Draw a histogram, frequency polygon and cumulative frequency
curve for the following data given below
Humidity
range
Frequency
(cms)
4.1.6.0
6.18.0
8.110.0
10.112.0
12.114.0
14.116.0
16.118.0
5
7
4
7
8
13
9
1
15. Draw a tridimentional graph for the following data. The yield of crop in tonnes
from 20002003.
Year
2000
2001
2002
2003
Wheat
20
27
29
30
Paddy
15
13
17
19
Pulses
19
14
13
17
16. Write a note on the primary and secondary data collection and their classification.
PART  C
(2  20 = 40 Marks)
Answer any TWO of the following
17. Give an account of different diagrammatic representations and tabulations
as statistical tools.
18. In an experiment sterilization of dogs were done against rabies, the following
results were obtained. Calculate 2 and discuss the effect of sterilization in
controlling rabies in dogs (at 0.05% of X2 at df =1,T.V =3.84)
Type vaccinated
Vaccinated
Non Vaccinated
Total
Affected sterilized
46
31
77
Not affected Non sterilized
13
29
42
Total
59
60
119
19. In a study of relation between age and height, the following ratios were obtained
on a sample
X Age (yrs)
1
5
9
10
12
14
18
21
22
Y Height (cms)
30
60
75
84
120
127 147 158 162
a) Obtain the regression equation for these data by least squares.
b) Predict the ratio of age 4,7,11 and 13 yrs with respective heights.
20. In a ‘High Crop’ a pesticide was used on three plots of land X,Y and Z; 4 beds
were prepared in each plot and High crop was added. The output of the crops
in the beds of plots X, Y and Z are given respectively by ANOVA, find whether
the difference on the production of crops on the plots is significant or not at
V=11 (Table value 0.73)
Beds
I
II
III
IV
Plot X Plot Y
7
4
9
12
11
7
13
16
Plot Z
11
13
2
14
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