#1
Which of the following epidemiological measures is used to quantify the overall impact of a disease in a population?
Relative Risk
Attributable Proportion
Prevalence
Incidence Rate
#2
Which of the following is a measure of association used in case-control studies?
Relative Risk
Odds Ratio
Hazard Ratio
Prevalence Ratio
#3
Which statistical test is commonly used to compare the means of two independent groups in epidemiological studies?
Chi-square test
Paired t-test
ANOVA
Independent samples t-test
#4
Which of the following is a measure of central tendency used to describe the average value of a continuous variable?
#5
What is the purpose of a 2x2 contingency table in epidemiological research?
To calculate the odds ratio
To estimate prevalence
To perform survival analysis
To assess the risk difference
#6
In the context of epidemiology, what does sensitivity measure?
The ability of a test to correctly identify those with the disease
The ability of a test to correctly identify those without the disease
The proportion of true negatives
The proportion of true positives
#7
Which screening technique is commonly used for detecting cervical cancer?
Mammography
Pap smear
Colonoscopy
PSA test
#8
Which type of study design is commonly used to investigate the cause-effect relationship between an exposure and an outcome?
Case-Control Study
Cross-Sectional Study
Cohort Study
Randomized Controlled Trial
#9
In epidemiology, what is the purpose of calculating the attributable risk percentage?
To estimate the proportion of the population exposed to a risk factor
To estimate the proportion of cases attributable to a specific exposure
To calculate the odds ratio
To assess the overall burden of a disease in the population
#10
In epidemiology, what is the difference between prevalence and incidence?
Prevalence is the number of new cases, while incidence is the total number of cases
Prevalence is the total number of cases, while incidence is the number of new cases
Prevalence measures the duration of a disease, while incidence measures the severity
Incidence measures the duration of a disease, while prevalence measures the severity
#11
In a diagnostic test, what does specificity measure?
The ability of a test to correctly identify those with the disease
The ability of a test to correctly identify those without the disease
The proportion of true negatives
The proportion of true positives
#12
What is the formula for calculating the odds ratio?
(a/c) / (b/d)
(a/b) / (c/d)
(a/b) * (c/d)
(a/c) * (b/d)
#13
In a cohort study, what does the hazard ratio measure?
The proportion of cases in the exposed group
The ratio of incidence rates between exposed and unexposed groups
The odds of developing the outcome in the exposed group
The risk difference between exposed and unexposed groups
#14
In screening programs, what is the purpose of a false positive result?
To identify individuals at high risk of the disease
To provide reassurance to individuals without the disease
To detect true cases of the disease
To reduce the cost of screening programs
#15
What is the primary purpose of randomization in a randomized controlled trial (RCT)?
To ensure equal distribution of confounding variables between groups
To increase the statistical power of the study
To maximize blinding of study participants
To simplify the study design
#16
What is the primary purpose of a confidence interval in epidemiological studies?
To determine the statistical power of the study
To estimate the precision of a point estimate
To establish causation between exposure and outcome
To calculate the prevalence ratio
#17
What is the purpose of the ROC curve in diagnostic testing?
To assess the sensitivity of the test
To evaluate the specificity of the test
To visualize the trade-off between sensitivity and specificity
To calculate the odds ratio