WorksheetsUCCOMT - MLS 107: Biostatistics & Epidemiology (part 2)
Total questions: 15
Worksheet time: 15mins
This is a place where an infectious agent can live and possibly multiply
Reservoir
Vehicle
Vector
Portal of Entry
Portal of Exit
In a hypothetical scenario, the results of the screening for a disease are as follows: Of the 500 subjects, 100 people have a positive test result. Of these 100, only 60 however, have the disease. What is the positive predictive value of this screening test?
60%
12%
32%
37.5%
There is not enough information
What would be the effect on age-specific incidence rates of breast cancer if women who have undergone mastectomy were excluded from the denominator?
The rate will decrease
The rate will increase
The rate will double
The rate will be unaffected
There is no definite effect
For diseases with high fatality rate and short duration, which of the following would represent the mortality and incidence rate?
Mortality rate will be higher than incidence rate
Incidence rate will be higher than mortality rate
Mortality and Incidence rate will be similar
There is no relationship between mortality and incidence rate
Only mortality rate would change continuously
What is the major purpose of randomization in a clinical trial?
Reduce bias in allocation of treatments
Ensure that the subjects represent the general population
Distribute the subjects according to severity of disease
Facilitate the measurement of outcome variables
Reduce errors in sampling variation
This is an observational study design conducted to determine the prevalence of a disease where both exposure and disease outcome are determined simultaneously for each subject.
Cross-Sectional Study
Case-Control Study
Ecologic Study
Retrospective Cohort Study
Cross-Over Trial
Which epidemiologic study design is not observational?
Cross-Sectional Study
Ecologic Study
Case-Control Study
Randomized Control Trial
All of the above
This is an observational study defined by the level at which the data are analyzed at the population or group level rather than individual level.
Case Report
Prospective Cohort Study
Cross-Over Trial
Randomized Control Trial
Ecologic Study
The following are examples of discrete random variables except:
Number of applicants for a vacant position
Number of books that were published by an author
The number of houses in a certain block
The volume of milk produced by a cow
The income of your father
This measurement scale is considered to be the highest level of measurement commonly used to measure height and weight. Fundamental to this scale is a true zero point.
Nominal Scale
Ordinal Scale
Ratio Scale
Interval Scale
Either A or D
This refers to the variation computed by finding the difference between the largest and smallest values in a set of observations.
Skewness
Mean
Median
Variance
Range
It is a graph constructed by using lines to join the midpoints of each interval or bin.
Frequency polygon
Histogram
Stem-and-Leaf Display
Bar graph
Scatterplots
These are measures of position that divide a data set into four pieces, each of which contains approximately one quarter of the data.
Deciles
Quartiles
Percentiles
Outliers
Range
This is a type of sampling in which the population is divided into groups according to some characteristics. Each of these groups is then sampled using another sampling technique.
Simple Random Sampling
Systematic Sampling
Stratified Random Sampling
Snowball Sampling
Purposive Sampling
According to the Central Limit Theorem, if the sample size (n) is large enough, the following statements are true except:
The resulting histogram will have a normal bell shape
The mean of the sampling distribution of sample means will be equal to the population mean
The standard deviation of the sampling distribution will be equal to the population standard deviation divided by the square root of n
Large enough refers to sample sizes of 30 and above
None of the above
