單項(xiàng)選擇題One rule that must always be followed in constructing frequency distributions is that （）.

A.the number of classes must be less than 10
B.each data point can only fall into one class
C.the width of each class is equal to the range
D.the number of intervals must be an odd number


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1.單項(xiàng)選擇題One advantage of a stem and leaf plot over a frequency distribution is that （）.

A.it contains more class intervals
B.the values of the original data are retained
C.the class midpoints are used as the stem
D.the class midpoints are used as the leaf

2.單項(xiàng)選擇題The number of class intervals in a frequency distribution is usually between （）.

A.3 and 5
B.7 and 9
C.5 and 15
D.1 and 25

3.單項(xiàng)選擇題A cumulative frequency polygon is also called （）.

A.an ogive
B.a histogram
C.a frequency polygon
D.a stem and leaf plot

4.單項(xiàng)選擇題If the individual class frequency is divided by the total frequency, the result is the （）.

A.midpoint frequency
B.cumulative frequency
C.stem and leaf plot
D.relative frequency

5.單項(xiàng)選擇題If data are grouped into intervals and the number of items in each group is listed, this could be called a （）

A.ogive
B.histogram
C.frequency distribution
D.stem and leaf plot