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.

 

1. Differentiate between random and non random sampling.
2. Define range. How is it estimated?
3. What are the parameters of binomial distribution?
4. What is co-efficient of variance?
5. Differenciate Hypothesis and Null Hypothesis.
6. Define the terms -Mean, mode and median.
7. Explain methods of collecting secondary data?
8. Define Poisson’s distribution.
9. What are Cartograms and Pictograms?
10. What is standard deviation and standard error?

 

PART – B                                        (4 ´ 10 = 40 Marks)

Answer any four of the following

 

11. In a distribution, skewness and kurtosis of data play a vital role. –
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	Number seen in water sample
Water bugs and insects	270
Paramecium	128
Earthworms	13
Frogs	4

 

1. 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	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

 

 

 

 

 

 

 

 

 

 

 

15. 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

 

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 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

 

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

 

1. Obtain the regression equation for these data by least squares.
2. Predict the ratio of age 4,7,11 and 13 yrs with respective heights.
3. 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

 

 

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