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Biostatistics Question Paper
Biostatistics
Course:Bachelor Of Education
Institution: Kenyatta University question papers
Exam Year:2009
KENYATTA UNIVERSITY
UNIVERSITY EXAMINATIONS 2009/2010
FIRST SEMESTER EXAMINATION FOR THE DEGREE OF BACHELOR OF
SCIENCE AND BACHELOR OF EDUCATION
SZL 300: BIOSTATISTICS
DATE: MONDAY, 28TH DECEMBER 2009
TIME: 8.00 A.M. - 10.00 A.M.
SECTION A
Answer ALL Questions. (Each question caries 5 marks)
1.
If the probability of a male insect emerging from a pupa selected at random is 0.65, what is the probability that 8 pupa will result in 3 females.
2.
An ecologist studying the abundance of the rare Sitatunga antelope within Ruma National Park counted the following number of animals visiting the only water point in the park on an hourly basis:
Hour
1 2 3 4 5 6 7 8 9 10 11 12
Number of animals counted 3 6 0 0 4 3 7 0 5 2 3 6
What is the probability of counting 4 Sitatunga antelopes in an hour
3.
Thirty four pregnant women gave birth to 19 girls and 15 boys. Does this constitute a significant departure from an equal sex ratio?
4.
The calcium concentration in the coelomic fluid of 13 individuals of a marine arthropod species are found to be: 37.64 mmole/kg with a variance of 9.42 mmole/kg. Calculate the 87.88% confidence interval for the mean calcium concentration in the coelomic fluid of the marine arthropod.
5.
A normally distributed population of 689 ten-month old children have a mean weight of 12.4 kg and a standard deviation of 6.2kg. How many children weigh between 9.3 and 15.5 kg?
6.
Explain the conditions under which data arcsine are transformed.
7.
Outline the features that should be noted when drawing the linear regression line.
8.
A cage contains six rats, two of them white and four of them black. A second cage contains four rats, two white and two black. A third contains five rats, three white and two black. If one rat is selected randomly from each cage, what is the probability that all rats selected will be white?
SECTION B
Answer any ONE question. Each question carries 30 marks.
9.
Data was given on alcohol consumption (4.5% per volume) in a sample of antenatal patients by marital status. Test the hypothesis that amount of alcohol consumption is independent of marital status.
Litres per week
Marital
Status
0
1-2 3-4 >5
Married
40
50 42 25
Divorced/Widowed
16
61 62 46
Single 32
36
110
71
10.
(a)
The heights of females were ranked against those of males yielding the following results.
Rank of Female heights
Rank of Male heights
11.5 5
1 7
15 13
8.5 2.5
5 5
2.5 8.5
10 14
11.5
Using appropriate statistics test the hypothesis that there is no difference between the height of males and females.
(b)
The wing length of 8 adult male pigeons reared under captivity were 27.8, 28.1, 26.9, 27.1, 27.3, 30.5, 28.5 and 26.5 cm. Is their ++mean wing length greater than the known mean wing length for wild pigeons of 24.8 cm?
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