Chapter 1: Quiz

1. The entities on which data are collected are
A.elements
B.populations
C.sets
D.samples
E.none of the above

2. The set of measurements collected for a particular element is (are) called
A.census
B.variables
C.observations
D.samples
E.none of the above

3. Quantitative data
A.are always nonnumeric
B.may be either numeric or nonnumeric
C.are always numeric
D.are always labels
E.none of the above

4. In a questionnaire, respondents are asked to mark their gender. Gender is an example of a
A.qualitative variable
B.quantitative variable
C.qualitative or quantitative variable, depending on how the respondents answered the question
D.ratio variable
E.none of the above

5. Temperature is an example of
A.a qualitative variable 
B.a quantitative variable
C.either a quantitative or qualitative variable
D.neither a quantitative nor qualitative variable
E.none of the above

6. Data collected at the same, or approximately the same point in time are
A.time series data 
B.approximate time series data 
C.cross-sectional data 
D.approximate data
E.none of the above

7. A statistics professor asked students in a class their age. On the basis of this information, the professor states that the average age of all the students in the university is 23 years. This is an example of
A.a census 
B.descriptive statistics
C.an experiment
D.statistical inference
E.none of the above

8. The owner of a factory regularly requests a graphical summary of all employees' salaries. The graphical summary of salaries is an example of
A.a sample 
B.descriptive statistics
C.statistical inference
D.an experiment
E.none of the above

9. The average age in a sample of 60 students at City College is 22. As a result of this sample, it can be concluded that the average age of all the students at City College
A.must be more than 22, since the population is always larger than the sample 
B.must be less than 22, since the sample is only a part of the population 
C.could be larger, smaller, or equal to 22 
D.could not be 22
E.none of the above

10. Statistical studies in which researchers control variables of interest are
A.experimental studies 
B.control observational studies 
C.non-experimental studies 
D.observational studies
E.none of the above

Click to view correct answers.