Which is a difference between primary and secondary data? MCQ with Answer and Explanation
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Question #1
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Life expectancy at age 65 being higher than at birth indicates:
Correct Answer: Option B
Explanation:
Life expectancy at birth is heavily influenced by early-life mortality; if many children die young, e₀ is low, but those surviving to 65 have already passed high-risk ages, so e₆₅ is naturally higher.
Life expectancy at birth is heavily influenced by early-life mortality; if many children die young, e₀ is low, but those surviving to 65 have already passed high-risk ages, so e₆₅ is naturally higher.
This question belongs to:
Accountancy and Statistics
Statistics
Question #2
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The mean of 15 observations is 40. It was found that an observation 23 was wrongly recorded as 32. The correct mean is:
Correct Answer: Option B
Explanation:
Correct sum = 15 × 40 - 32 + 23 = 600 - 9 = 591. Correct mean = 591/15 = 39.4.
Correct sum = 15 × 40 - 32 + 23 = 600 - 9 = 591. Correct mean = 591/15 = 39.4.
This question belongs to:
Accountancy and Statistics
Statistics
Question #3
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According to Sturges' rule, the approximate number of classes for n = 50 is: (Use k = 1 + 3.322 log₁₀ n)
Correct Answer: Option B
Explanation:
log₁₀50 ≈ 1.699; 3.322 × 1.699 ≈ 5.64; 1 + 5.64 = 6.64, which rounds to 7 classes.
log₁₀50 ≈ 1.699; 3.322 × 1.699 ≈ 5.64; 1 + 5.64 = 6.64, which rounds to 7 classes.
This question belongs to:
Accountancy and Statistics
Statistics
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