For ease of data entry into a university database, 1 denotes that the student is an undergraduate and 2 indicates that the student is a graduate student. In this case data are（）
A. categorical
B. quantitative
C. either categorical or quantitative
D. neither categorical nor quantitative
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Statistical inference（）
A. refers to the process of drawing inferences about the sample based on the characteristics of the population
B. is the same as descriptive statistics
C. is the process of drawing inferences about the population based on the information taken from the sample
D. is the same as a census
The ratio scale of measurement has the properties of（）
A. only the ordinal scale
B. only the nominal scale
C. the rank scale
D. the interval scale
The interval scale of measurement has the properties of the（）
A. ratio and nominal scales
B. ratio and ordinal scales
C. ratio scale
D. None of these alternatives is correct
All the data collected in a particular study are referred to as the（）
A. inference
B. variable
C. data set
D. None of these alternatives is correct
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