To convert a frequency distribution to a relative frequency distribution（）
A. find the difference between consecutive lower class limits
B. divide the class frequency by the total number of observations
C. divide the lower limit of the first class by the class interval
D. multiple the class frequency by 100
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Which of the following is not a guideline for a frequency distribution（）
Avoid open-ended classes
B. Use the 2k rule to determine the number of classes
C. Make the lower limit of the first class a multiple of the class interval
D. Each class should have more than 5 observations
What is true about the range（）
A. Only two values are used in its calculation
B. It is in different units than the mean
C. It can be used for nominal data
D. All values are used in its calculation
The main purpose of descriptive statistics is to（）
A. summarize data in a useful and informative manner
B. estimate a population characteristic based on a sample
C. determine if the data adequately represents the population
D. gather or collect data
According to Laozi, the effective approach one should adopt for the knowledge of the Dao is through______（）
A. the correct use of names
B. the precise description of language
C. concepts and logical reasoning
D. the intuitive understanding of mind
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