Primary data are the same as which kind of data?
Correct answer C. Ungrouped
Explanation
Primary data are first-hand observations that have not yet been classified or grouped, so they are in raw, ungrouped form.
Tip: press A, B, C or D to answer, and N for the next question.
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Correct answer B. Population data
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For the values 10, 20, 30, 40 and 50, whose mean is 30, what is the sum of the deviations from the mean?
Correct answer D. Zero
Which of these measures uses every observation in the series?
Correct answer B. Standard Deviation
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