单项选择题

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

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单项选择题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

单项选择题A cumulative frequency polygon is also called （）.

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

单项选择题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

单项选择题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

单项选择题Which of the following is not the goal of descriptive statistics?（）

A.Summarising data
B.Displaying aspects of the collected data
C.Reporting numerical findings
D.Estimating characteristics of the population