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.
- 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 (4 ´ 10 = 40 Marks)
Answer any four of the following
- In a distribution, skewness and kurtosis of data play a vital role. –
- Explain the structure of a ‘Table’ and its requirements.
- a) Draw a pie diagram of the following data and comment on it.
Organisms | Number seen in water sample |
Water bugs and insects | 270 |
Paramecium | 128 |
Earthworms | 13 |
Frogs | 4 |
- Pi e is a significant tool in diagramatic representation Justify.
- Draw a histogram, frequency polygon and cumulative frequency
curve for the following data given below
Humidity range | 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 |
Frequency (cms) | 5 | 7 | 4 | 7 | 8 | 13 | 9 |
- Draw a tridimentional graph for the following data. The yield of crop in tonnes from 2000-
Year | Wheat | Paddy | Pulses |
2000 | 20 | 15 | 19 |
2001 | 27 | 13 | 14 |
2002 | 29 | 17 | 13 |
2003 | 30 | 19 | 17 |
- 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
- Give an account of different diagrammatic representations and tabulations
as statistical tools.
- In an experiment sterilization of dogs were done against rabies, the following results were obtained. Calculate c2 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 | Affected sterilized | Not affected Non sterilized | Total |
Vaccinated | 46 | 13 | 59 |
Non Vaccinated | 31 | 29 | 60 |
Total | 77 | 42 | 119 |
- 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 |
- Obtain the regression equation for these data by least squares.
- Predict the ratio of age 4,7,11 and 13 yrs with respective heights.
- 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 | Plot X | Plot Y | Plot Z |
I | 7 | 4 | 11 |
II | 9 | 12 | 13 |
III | 11 | 7 | 2 |
IV | 13 | 16 | 14 |