商务统计学章节测试课后答案2024春

第二章测试

1. 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
答案:B
2.If the individual class frequency is divided by the total frequency, the result is the __________.
A:relative frequency B:cumulative frequency C:midpoint frequency D:stem and leaf plot 3.A cumulative frequency polygon is also called _______________.
A:an ogive B:a frequency polygon C:a histogram D:a stem and leaf plot 4.The number of class intervals in a frequency distribution is usually between ___________.
A:1 and 25 B:7 and 9 C:5 and 15 D:3 and 5 5.One advantage of a stem and leaf plot over a frequency distribution is that __________.
A:the class midpoints are used as the leaf B:the class midpoints are used as the stem C:it contains more class intervals D:the values of the original data are retained 6.One rule that must always be followed in constructing frequency distributions is that ________.
A:the number of classes must be less than 10 B:the width of each class is equal to the range C:the number of intervals must be an odd number D:each data point can only fall into one class 7.Which of the following is best to show the percentage of a total budget that is spent on each category of items?
A:stem and leaf chart B:ogive C:histogram D:pie chart 8.A cumulative frequency distribution would provide _____________.
A:the proportion of the total frequencies which fall into each class B:a running total of the frequencies in the classes C:a very cloudy picture of the frequencies D:a graph of a frequency distribution 9.The number of phone calls arriving at a switchboard each hour has been recorded and the following frequency distribution has been developed.Class IntervalFrequency20-under 403040-under 604560-under 808080-under 10045What is the cumulative frequency of the third class?
A:80 B:0.40 C:155 D:75 10.The number of phone calls arriving at a switchboard each hour has been recorded and the following frequency distribution has been developed.Class IntervalFrequency20-under 403040-under 604560-under 808080-under 10045What is the approximate range of the number of phone calls arriving each hour?
A:20 B:200 C:100 D:80