exams of- Biostatistics

من طرف **dr:sniper** الجمعة 18 أبريل 2008, 2:31 am

Examination of Veterinary Biostatistics
(1^st year undergraduate students)

7- 6 - 2007

Time allowed: 2 Hours

Answer The Following:
1. Define: Statistics
- Data -
Variable -
Qualitative variable
- Quantitative variable
- Sample -
Random
sample

2. The following are the weights of quails at 4 weeks of age used for certain experiment:
60, 33, 85, 52, 65, 84, 77, 65, 57, 74, 71, 81, 80, 45, 41
Calculate: mean, mode, median, variance, standard deviation, standard error.
3. In an experiment intended to study the effect of caccidian parasite infection on growth of rabbits, the
following results were obtained, which represent weight gains of infected and uninfected rabbits in 10
weeks period:

Infected	70	85	94	101	107	118	120	130	140	150
Uninfected	104	107	113	119	125	124	129	136	146	161

Is there a significant difference between the two groups? (Table = 2.87)

من طرف **dr:sniper** الجمعة 18 أبريل 2008, 2:31 am

(10 marks)
4. A group of 15 calves were allotted to three groups equally and randomly. Each group was fed on a different ration A, B, C and the increases in weights (kg) during a certain period were:

A	B	C
63	110	95
48	133 -	84
52	120	99
46	126	87
57	129	93

Find out the ANOVA table and test the hypothesis that the three rations are equal in their effects.
(Table-3.81)

5. In a study of the effect of dietary component (X) on plasma lipids composition (Y), the following data were obtained from a sample of 10 experimental animals:

X	18	21	28	35	47	33	40	41	28	21
Y	38	40	47	54	66	52	29	60	47	40

a. Calculate the linear regression equation for the above results.
b. Predict the plasma lipids composition in case those values of dietary component are 30, 50, and 25.
c. Calculate the correlation coefficient_____________________________________________________

من طرف ahmaddeyab الخميس 09 أكتوبر 2008, 7:55 pm

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exams of- Biostatistics

exams of- Biostatistics

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رد: exams of- Biostatistics