What is the sample variance of the values 3, 5 and 7?
Correct answer: C. 4
- A. 2
- B. 3
- C. 4
- D. 6
Explanation
The mean is 5, and the squared deviations are 4, 0 and 4. Their sum is 8, which is divided by n − 1, or 2, for a sample variance of 4.
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About Measures of Central Tendency and Dispersion
Central tendency includes mean, weighted mean, median and mode for raw and grouped data. Dispersion covers range, quartiles, interquartile range, variance, standard deviation and coefficient of variation, including the effect of changes in scale and the distinction between a representative centre and the spread around it.
Practise Measures of Central Tendency and Dispersion
30 free Measures of Central Tendency and Dispersion MCQs from Quantitative Methods, each with the correct answer and an explanation. Unlimited attempts, no account needed.
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