Which of the following is (are) not a symmetrical distribution?
a. a bell-shaped curve
b. a J-shaped curve
c. a rectangular curve
d. an inverted U-shaped curve
e. a bell-shaped, J-shaped, and an inverted U-shaped curve
In a frequency polygon the points are plotted over _______ at a height corresponding to the frequency of the interval.
a. the midpoint of each interval c. the upper real limit
b. the lower real limit d. none of these
When constructing bar graphs, the bars do not touch each other because _______.
a. it looks nicer
b. it emphasizes the lack of quantitative relationship between the categories
c. it is traditional
d. none of these
In graphing frequency distributions, _________ is usually plotted on the abscissa.
a. frequency c. the score value
b. class width d. interval width
What indicates the number of scores that fell below the upper real limit of each interval?
a. relative frequency distribution c. cumulative percentage distribution
b. cumulative frequency distribution d. none of these
What indicates the proportion of the total number of scores that occurred in each interval?
a. relative frequency distribution c. cumulative percentage distribution
b. cumulative frequency distribution d. none of these
If i = 7, the scores are integer, and the minimum value of the distribution of scores is 8, what would the lowest class interval be?
a. 0-7
b. 7-14
c. 8-16
d. 8-15
e. 7-13
If the range of a distribution were 89 and the data were reported as whole numbers, what would the width of the class interval be if one chose to group the distribution into approximately 14 class intervals?
a. 14
b. 89
c. 5
d. 6
e. 7
The range of a set of scores with a maximum value of 92 and a minimum value of 26 is _________.
a. 65 c. 67
b. 66 d. 92
When individual scores are combined into groups, _________.
a. information is lost
b. data is added
c. a meaningful visual display can result depending on the interval width
d. information is lost and data is added
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