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Statistics: Random Variables

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1. Give two measures of variability.___________________ Which is the most reliable?

2. The distribution 0,2,2,3,13 has a mean of 4. What would the mean be if each score was multiplied by a constant of 2?

3. In the distribution 0,2,3,4,6, what is the percentile rank of the score 3?

4. Give three measures of central tendency?

5. For the following distributions: 8,5,6,9,3,5. What is the Mean, Median, and Mode?

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This solution is comprised of a detailed explanation to give two measures of variability.

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1. Range and Variance. The most reliable measure of variability is ...

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Chris Busu, PhD (IP)
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  • BSc, University of Bucharest
  • MSc, Ovidius
  • MSc, Stony Brook
  • PhD (IP), Stony Brook
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