1. The high score of a distribution minus the low score is known as the

    2. a. deviation   b. variability   c. range   d. standard deviation  

  2. Common cause variation is
    1. due to increasing the average
    2. the single cause of all process output
    3. due to bad management decisions
    4. variation inherent in the process
  3. To plot the output of a process operating over time, use a

    4. a. means chart   b. scatterplot   c. run chart   d. bar chart  

  4. The square root of the average squared deviation score is the

    5. a. expected mean deviation   b. weighted mean   c. standard deviation   d. trimmed deviation  

  5. The _____ is NOT an index of dispersion of a set of test scores.

    6. a. standard deviation   b. range   c. variance   d. mean  

  6. The box plot is particularly useful for
    1. calculating the standard deviation
    2. identifying outliers
    3. approximating the range
    4. relating the mean to the trimmed mean
  7. A percentile score of 65 on a test means that
    1. the person did better than 65% of the group tested
    2. 65% of the items were answered correctly
    3. the person's performance equaled that of 65% of the group tested
    4. 65% of the group tested did better than the person
  8. The second quartile is the

    9. a. median   b. mean   c. mode   d. trimmed mean  

  9. To construct a box plot, the _____ is NOT needed.

    10. a. 75th percentile   b. median   c. min   d. mean  

  10. Without doing computations, which set of data values has the highest standard deviation?
    1. 100, 100, 101, 102, 103, 104, 104
    2. 2, 7, 7, 7, 8, 8, 13
    3. 2, 6, 7, 8, 9, 10, 48
    4. 107, 108, 109, 110, 113, 115, 117