Which of the following is a measure of variability in a distribution of scores?

Describing Data: Measures of Variability Multiple Choice 1 .       An instructor gave students a 20-item quiz on a course topic. The distribution of scores on the quiz was: 8, 8, 10, 10, 11, 12, 12, 13, 13, 13 15, 15, 16, 17, 19, 19, 20, 20, 20. What is the range for these scores? [Hint]   20.   12.   16.   A range cannot be calculated for this set of scores. 2 .       The _____ for a set of scores can be obtained by using the formula X75 – X25. [Hint]   range   semi-interquartile range   interquartile range   median 3 .       The SIQR provides a measure of the average spread of scores for _____ of the scores above and below the [Hint]   25 percent; median.   75 percent; median   25 percent; mean.   all; median. 4 .       The symbol for the sample variance is [Hint] 5 .       The sample variance is given by the formula [Hint] 6 .       _____ is the symbol for the population variance. [Hint] 7 .       For the set of three scores, 3, 6, 9, S2 is [Hint] 8 .       For the set of three scores, 3, 6, 9, s2 is [Hint] 9 .       Suppose that is 7 for a population of scores. The variance for those scores is then [Hint]     7.   49.   21. 10 .       The SS for a set of scores is 80 based on a sample of size 21. Thus, s2 for the scores is [Hint]   4.   2.0.     16. 11 .       If s2 for a set of scores is 81, then s for those scores [Hint]   is 3.   is 9.   is (81)2.   cannot be determined from the information given. 12 .       Which of the following sets of scores would you expect to have the largest value of s? [Hint]   5, 5, 6, 7, 7.   7, 7, 7, 7, 7.   5, 6, 7, 8, 9.   5, 5, 7, 9, 9. 13 .       If s = 0 for a distribution of scores, then which of the following is true? [Hint]   An error was made in the calculation because s cannot equal 0.   All the scores in the distribution are equal to each other.   The sample variance of the scores was equal to 10.   The distribution was either positively or negatively skewed. 14 .       In journal articles following the Publication Manual of the American Psychological Association style, the standard deviation is usually represented by [Hint]   SD.   S.   s   15 .       You have collected a set of scores from participants performing a reaction time task. You decide that the most appropriate measure of central tendency for the scores is the median. The most appropriate measures of variability would thus be the [Hint]   standard deviation.   sample variance.   SIQR.   range.

What does variability refer to in a distribution of scores?

Which one of the following is best used to measure variability of scores?

Which of the following is a measure of the variability of a distribution?

What are the 4 measures of variability?