Which of the following is a correct statement about probability（）
A. Probability values range from 0 to 1, inclusive
B. Probabilities may assume negative values
C. Probabilities may be greater than 1
D. Probabilities are limited to one decimal place
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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
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
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