Get premium membership and access revision papers, questions with answers as well as video lessons.
Got a question or eager to learn? Discover limitless learning on WhatsApp now -
Start Now!
Epidemiology And Biostatistics Question Paper
Epidemiology And Biostatistics
Course:Bachelor Of Science In Nursing And Public Health
Institution: Kenyatta University question papers
Exam Year:2009
KENYATTA UNIVERSITY
FIRST SEMESTER EXAMINATIONS 2009/2010
UNIVERSITY EXAMINATIONS FOR DEGREE OF BACHELOR OF SCIENCE
(NURSING AND PUBLIC HEALTH)
HNS 300: EPIDEMIOLOGY AND BIOSTATISTICS
DATE: Monday 21st December 2009
TIME: 11.00am – 1.00pm
INSTRUCTIONS:
• Answer ALL Questions
• For section A tick the correct answer
• For section B and C use the provided answer sheet
SECTION A (20 Marks)
1.
Which of the following best describes the study design that can be either
retrospective or prospective and is often used when the investigators are interested
in rare exposures?
A.
intervention
trials
B.
cohort
studies
C.
prevalence
studies
D.
case
control
study
2.
Which is the median of the following observations?
6, 7, 8, 8, 8, 10, 12, 13 , 15 ,16
A.
10
B.
9
C.
8
D.
8.5
3.
What is the mean of data in 2 above?
A.
10
B.
9
C.
10.3
D.
11.4
Page 1 of 7
4.
What is the standard deviation of the data in 2 above?
A.
3.50
B.
10.8
C.
11.4
D.
3.15
The following is background information for quest Q5-Q6 Objective: To
determine the prevalence of sexually transmitted (STD) and high-risk sexual
behaviour for STD among adolescent males admitted to a juvenile detention
facility.
TABLE 1: Behavioral variables in 100 subjects*
Variable
Mean (SD) Range Median
Age at first coitus
12.3 (2.0)
5-17 13
No. lifetime partners
13.7 (16.8)
1-100 8
No. partners past 4 months
2.9 (3.4)
0-30
2
No. weeks since last sex
5.8 (15.1)
1-260 2
*SD=standard
deviation
5.
Which of the descriptive statistics in Table 1 (mean, SD, range, Median) is most
susceptible to being influenced by a single extreme value? (Choose one best
answer.)
A.
Mean
B.
SD
C.
Range
D.
Median
6.
Of the four variables in Table 1, which has the most symmetrical (normal-like)
distribution? (Choose one best answer.)
A.
Age at first coitus
B.
Number of lifetime partners
C.
Number of partners in the past 4 months
D.
Number of weeks since last sex
Page 2 of 7
7.
Which of the following best describes the study design that can be either
retrospective of prospective and is often used when the investigators are interested
in rate exposures.
A.
Intervention
trials
B.
Cohort
studies
C.
Prevalence
studies
The following is background information for question Q8-Q9
Sexually transmitted diseases in adolescence male admitted to a juvenile detention
facility.
No. Positive
Disease/tested
Syphilis
7/930
Gonorrhea
42/940
Chlamydia
66/957
Any of the above
109/90
8.
Based on the above data and assuming that the two diseases have the same
average duration, how do their incidence rates compare in this population?
(Choose the one correct answer.)
A.
Incidence of gonorrhea is lower than that of Chlamydia.
B.
Incidence of gonorrhea is same as that of Chlamydia
C.
Incidence of gonorrhea is higher than that of Chlamydia
9.
Based on the above data but this time assume that the two diseases have the same
incidence. How do their average durations compare in this population? Choose
the one correct answer.
A.
Duration of gonorrhea is shorter that that of Chlamydia.
B.
Duration of gonorrhea is longer that that of Chlamydia.
10.
Which of the following does NOT describe epidemiology?
A.
Study of health and disease in the population
B.
Study of basic science of public health
C.
Study of controlling health problems
D.
Study of distribution and determinants of health related status
Page 3 of 7
11.
Even if the investigators are careful in the selection of cases and controls,
selection bias can make interpretation of results difficult. Which of the following
is NOT a situation that can produce selection bias?
A.
The exposure has some influence on the process by which controls are
selected.
B.
The exposure has some influence on the process of case ascertainment.
C.
The disease status has some influence on the recall of exposures.
D.
The exposed cases are reported to registries more than, unexposed.
12.
A dental examiner and gold standard score dental caries on 200 subjects as shown
in the table below.
Gold
Standard
Examiner No.
Caries
Caries
No. Caries
164
8
Caries 6
22
What are the values of sensitivity and specify?
A.
Sensitivity and specificity 3.5% and 96.5%, respectively.
B.
Sensitivity and specificity 95.3% and 73.3%, respectively.
C.
Sensitivity and specificity 96.5% and3.5%, respectively.
D.
Sensitivity and specificity 4.7% and 95.3%, respectively.
13.
Which of the following is property of categorical data.
A.
Categorical data are measured in ordinal or nominal scale
B.
Categorical data range from 0 to 1.
C.
Categorical data are measured in continuous scale.
D.
Categorical
data
is
assigned real numbers.
14.
Which of the following statements is NOT correct.
A.
Epidemic is the occurrence in a community or region of a group of illness
of a similar nature in excess of natural expectation.
B.
Pandemic is the irregular presence of a disease across a wide area or
region
C.
Endemic is the constant presence of a disease in a given geographical area
or a population group
D.
Pandemic is a world wide epidemic.
More Question Papers
Popular Exams
Return to Question Papers