品合格率指标是（）

单项选择题品合格率指标是（）

A.比例相对指标
B.结构相对指标
C.比较相对指标
D.强度相对指标

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1.单项选择题某厂某年职工劳动生产率为20000元，是历史最高水平的1.2倍。这里的1.2倍是（）

A.比例相对数
B.计划完成相对数
C.强度相对数
D.动态相对数

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2.问答题什么是季节变动？研究它的意义何在？如何测定季节变动？

参考答案：含义：季节变动是指社会经济现象受自然条件和社会风俗等因素的影响，在一年内随季节更替而出现的周期性波动。如大多数农副产品的...

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3.问答题常用的长期趋势测定的方法有哪些？各有什么特点？

参考答案：（1）随手法。最简单的方法。这种方法不需要计算，而是直接在散点图上，根据主观判断随手画出表示长期趋势的直线。为了防止和减...

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4.问答题企业生产一种产品需顺次经过四个车间，这四个车间的废品率分别为1.5%、2.0%、2.0%和1.0%。该企业生产这种产品的平均废品率是多少？

参考答案：

平均废品率＝1.63%

5.单项选择题 The number of phone calls arriving at a switchboard each hour has been recorded and the following frequency distribution has been developed.
What is the approximate range of the number of phone calls arriving each hour？（）

A.80
B.200
C.20
D.100

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6.单项选择题 The number of phone calls arriving at a switchboard each hour has been recorded and the following frequency distribution has been developed.
What is the cumulative frequency of the third class？（）

A.80
B.0.40
C.155
D.75

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7.单项选择题A cumulative frequency distribution would provide（）.

A.a graph of a frequency distribution
B.a running total of the frequencies in the classes
C.the proportion of the total frequencies which fall into each class
D.a very cloudy picture of the frequencies

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8.单项选择题Which of the following is best to show the percentage of a total budget that is spent on each category of items？（）

A.histogram
B.ogive
C.stem and leaf chart
D.pie chart

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9.单项选择题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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10.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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