Multiple choice

Which of the following parameters measures how far a set of numbers is spread out?

  1. Probability distribution

  2. Statistical inference

  3. Variance

  4. Simple random sample

  5. Systematic sampling
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C Correct answer
Explanation

variance measures how far a set of numbers is spread out. (A variance of zero indicates that all the values are identical.) A non-zero variance is always positive: A small variance indicates that the data points tend to be very close to the mean (expected value) and hence to each other, while a high variance indicates that the data points are very spread out from the mean and from each other.

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