Smh2131:Medical Statistics Question Paper
Smh2131:Medical Statistics
Course:Bachelor Of Science In Public Health
Institution: Meru University Of Science And Technology question papers
Exam Year:2010
INSTRUCTIONS: Answer questions one and any other two questions
QUESTION ONE - (30 MARKS)
a) Define the following statistical terms (5 Marks)
i. Variable
ii. Population
iii. Bionomial distribution
iv. Null hypothesis
v. Non parametric tests
b) Briefly describe five types of data giving examples. (5 Marks)
c) Outline the standard procedure for hypothesis testing. (5 Marks)
d) Given that the following data of erythrocyte sedimentation rate (ESR) in grams 3, 4, 5, 4,
2, 4, 5 and 3; calculate
i. The mean (1 Mark)
ii. Range (1 Mark)
iii. Mean deviation (2 Marks)
iv. Variance (2 Marks)
v. Standard deviation (3 Marks)
vi. Coefficient of variation (2 Marks)
e) In a Coronary artery surgery after a follow up for up to 11 years, 410 patients were
hospitalized 1170 times. What is the probability of the patient being hospitalized 5
times? (4 Marks)
2
QUESTION TWO – (20 MARKS)
The following is given as sample data on a sample of infant birth weights in Kgs.
4.2, 4.3, 4.4, 4.4, 4.4, 4.5, 4.5, 4.6, 4.6, 4.6, 4.6, 4.7,
4.7, 4.7, 4.8, 4.8, 4.8, 4.8, 4.9, 4.9, 5.0, 5.0, 5.0, 5.0, 5.0
5.1, 5.2, 5.2, 5.3, 5.3, 5.3, 5.4, 5.5
a) Record the above data in a frequency table. (15 Marks)
Xi (Kg) Fi Cumulative Freq XiFi
b) Calculate the mean using appropriate formula (5 Marks)
QUESTION THREE – (20 MARKS)
Assume that the entire population of patients with severe aplastic anaemia has been studied and
the probability of 10 years survival is 0.8. Consider a group of 5 patients with the disease.
a) What is the probability that 0 patients will live for 10 years? (6 Marks)
b) What is the probability that exactly 2 patients will not live for 10 years? (7 Marks)
c) What is the probability that exactly 5 patients will live for 10 years? (7 marks)
QUESTION FOUR – (20 MARKS)
The following data are percentages of deaths of HIV/AIDS patients after exposure to three
antiretroviral drugs for a period of 3 years. Assuming that all patients had an equal initial count
of CD4 T cells, test the null hypothesis that efficacy is similar for all the drugs using nonparametric
test. (20 Marks)
DRUG A DRUG B DRUG C
50 45 72
54 36 63
53 42 66
57 40 74
3
QUESTION FIVE – (20 MARKS)
In a heterozygous class where the genetic theory led a researcher to expect normal and anaemic
infants from HIV/AIDS infected mothers in the ratio of 3:1 respectively. The research obtained
450 normal infants out of the total 700 infants.
a) State the null and alternative hypothesis. (4 Marks)
b) Calculate the expected values. (5 Marks)
c) Test whether these results are constitent with genetic theory. (11 Marks)
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