Data collected over several time periods are（）
A. time series data
B. time controlled data
C. crossectional data
D. time crossectional data
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A portion of the population selected to represent the population is called（）
A. statistical inference
B. descriptive statistics
C. a census
D. a sample
Quantitative data（）
A. are always nonnumeric
B. may be either numeric or nonnumeric
C. are always numeric
D. None of these alternatives is correct
Ordinary arithmetic operations are meaningful（）
A. only with categorical data
B. only with quantitative data
C. either with quantitative or categorical data
D. None of these alternatives is correct
Another name for “observations” is（）
A. views
B. variables
C. cases
D. None of these alternatives is correct
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