The pre-testing of a questionnaire is also called: MCQ with Answer and Explanation
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Question #1
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A medical test has 95% sensitivity and 90% specificity. If disease prevalence is 1%, the probability that a person with a positive test actually has the disease is approximately:
Correct Answer: Option C
Explanation:
Using Bayes: P(Disease|Positive) = [Sensitivity × Prevalence] / [Sensitivity×Prev + (1-Specificity)×(1-Prev)] = (0.95×0.01) / (0.95×0.01 + 0.10×0.99) = 0.0095 / (0.0095 + 0.099) = 0.0095/0.1085 ≈ 0.0876 ≈ 8.7%. Highlights low positive predictive value when prevalence is low.
Using Bayes: P(Disease|Positive) = [Sensitivity × Prevalence] / [Sensitivity×Prev + (1-Specificity)×(1-Prev)] = (0.95×0.01) / (0.95×0.01 + 0.10×0.99) = 0.0095 / (0.0095 + 0.099) = 0.0095/0.1085 ≈ 0.0876 ≈ 8.7%. Highlights low positive predictive value when prevalence is low.
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Accountancy and Statistics
Statistics
Question #2
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A table that presents data according to two independent characteristics simultaneously is called a:
Correct Answer: Option C
Explanation:
A two-way table crosses two distinct variables, such as displaying population by both age and gender.
A two-way table crosses two distinct variables, such as displaying population by both age and gender.
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Accountancy and Statistics
Statistics
Question #3
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Which index number is most commonly used to measure inflation and changes in the purchasing power of money for standard households?
Correct Answer: Option B
Explanation:
The CPI (or Cost of Living Index) measures the average change in prices paid by consumers for a basket of goods and services.
The CPI (or Cost of Living Index) measures the average change in prices paid by consumers for a basket of goods and services.
This question belongs to:
Accountancy and Statistics
Statistics
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