单项选择题

Which of the following are counting and describing associated with

A．Descriptive statistics
B．Unknown variables
C．Qualitative changes
D．Inferential statistics
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单项选择题
Why does the author mention the mother and father in the first paragraph
A．To present the background of statistics in a humorous and understandable way
B．To point out that parents can teach their children statistics
C．To explain that there are different kinds of variables
D．To introduce inferential statistics
单项选择题
What is the purpose of examining a sample of a population
A．To tabulate collections of data
B．To compare different groups
C．To consider all the quantitative variables
D．To predict characteristics of the entire population
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