单项选择题

The word "unwieldy" in the second paragraph is closest in meaning to ________.

A．difficult to collect
B．difficult to tackle
C．incomprehensive
D．uncontrollable
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单项选择题
Which of the following statements is true about descriptive statistics
A．It combines quantitative variables and qualitative variables.
B．It can be used to deal with only quantitative variables.
C．It helps to summarize properties of a group of data.
D．It helps to make predictions using a sample of observations.
单项选择题
A sample of a population is often examined for the following purposes except ________.
A．to make a more accurate prediction of trend
B．to improve efficiency and avoid unnecessary work
C．to save the trouble of approaching every members
D．to predict characteristics of the entire population
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