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Question #1
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In a moderately skewed distribution, if the mean is 45 and the mode is 39, the median is approximately:
Correct Answer: Option D
Explanation:
Using the empirical relationship: Mode ≈ 3×Median - 2×Mean. Rearranging: Median ≈ (Mode + 2×Mean)/3 = (39 + 90)/3 = 129/3 = 43. This approximation holds for moderately skewed unimodal distributions.
Using the empirical relationship: Mode ≈ 3×Median - 2×Mean. Rearranging: Median ≈ (Mode + 2×Mean)/3 = (39 + 90)/3 = 129/3 = 43. This approximation holds for moderately skewed unimodal distributions.
This question belongs to:
Accountancy and Statistics
Statistics
Question #2
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The dependency ratio measures the ratio of:
Correct Answer: Option A
Explanation:
Dependency ratio = (Population under 15 + Population over 65) / Population aged 15-64.
Dependency ratio = (Population under 15 + Population over 65) / Population aged 15-64.
This question belongs to:
Accountancy and Statistics
Statistics
Question #3
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Which method is NOT a technique for collecting primary data?
Correct Answer: Option C
Explanation:
Extraction from government census publications is a source of secondary data, not a method for collecting primary data, which requires firsthand gathering by the investigator.
Extraction from government census publications is a source of secondary data, not a method for collecting primary data, which requires firsthand gathering by the investigator.
This question belongs to:
Accountancy and Statistics
Statistics
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