In questionnaire design, what is the primary purpose of pre-testing? MCQ with Answer and Explanation
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Question #1
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The geometric mean is not defined when any observation is:
Correct Answer: Option C
Explanation:
GM requires all values to be strictly positive; zero or negatives make it undefined.
GM requires all values to be strictly positive; zero or negatives make it undefined.
This question belongs to:
Accountancy and Statistics
Statistics
Question #2
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Three machines produce 60%, 30%, 10% of items with defect rates 2%, 3%, 4%. If an item is defective, probability it came from the third machine is:
Correct Answer: Option C
Explanation:
P(D) = 0.6×0.02 + 0.3×0.03 + 0.1×0.04 = 0.012+0.009+0.004=0.025. P(M3|D) = 0.004/0.025 = 0.16.
P(D) = 0.6×0.02 + 0.3×0.03 + 0.1×0.04 = 0.012+0.009+0.004=0.025. P(M3|D) = 0.004/0.025 = 0.16.
This question belongs to:
Accountancy and Statistics
Statistics
Question #3
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If a data set has a median of 50, it means:
Correct Answer: Option B
Explanation:
Median is the middle value when data are arranged in order; half the values are below and half above it.
Median is the middle value when data are arranged in order; half the values are below and half above it.
This question belongs to:
Accountancy and Statistics
Statistics
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