- Without doing computations, which set of data values has the highest standard deviation?
- 12, 12, 13, 15, 16, 16, 17
- 124, 125, 132, 134, 140, 145, 198
- -1, 0, 2, 6, 7, 8, 9
- 1999, 2004, 2009, 2022, 2025, 2033, 2040
- A run demonstrated on a run chart is
- an indicator of common cause variation
- a sequence of consecutive data values on one side of the center line
- a persistent difference between the range and interquartile range
- an indicator of a stable system
- Compared to a run chart, a time series chart usually applies to
- uses dates instead of times to label the horizontal axis
- the analysis of process stability
- the analysis of more general outcomes, such as annual GNP
- data that indicates increasing variability over time
- To plot the output of a process operating over time, use a
a. scatterplot b. bar chart c. means chart d. run chart
- A percentile score of 65 on a test means that
- 65% of the group tested did better than the person
- the person did better than 65% of the group tested
- 65% of the items were answered correctly
- the person's performance equaled that of 65% of the group tested
- Where "n" is sample size, the degrees of freedom for the standard deviation is
a. n-2 b. n/2 c. n-1 d. n
- Which of the following sets of scores is a perfectly symmetrical and unimodal distribution?
a. 6,7,8,9,10 b. 1,1,2,2,3,4,4,5,5 c. 1,2,3,3,4,5 d. 1,6,7,8,8,8,8,9,10,11
- The _____ is NOT an index of dispersion of a set of test scores.
a. standard deviation b. range c. mean d. variance
- Which of the following is a problem associated with using only the mean to represent central tendency?
- It can only be used in inferential statistics.
- It is more influenced by extreme scores than the median and mode.
- It is inappropriate when the distribution is normal.
- It has more variability associated with it than the median and mode.
- To construct a box plot, the _____ is NOT needed.
a. median b. 75th percentile c. mean d. min