, Chapter 1: Collecting Data in Reasonable Ways
Concept Quiz
Name _________________________
The answers to the questions below frequently depend on remembering facts, under-
standing concepts, and knowing statistical vocabulary. Before answering, be sure to read
carefully!
T F 1. A simple random sample of size n is by definition a sample that is selected
in a manner to guarantee each individual in the population an equal chance
of selection.
T F 2. Clusters are non-overlapping subgroups of a population that have been
identified as homogeneous.
T F 3. Blocking is used to filter out the effects of some extraneous variables.
T F 4. Response bias occurs when responses are not actually obtained from all
individuals selected for inclusion in the sample.
T F 5. Selection bias occurs if only volunteers are used in a study.
T F 6. Stratified sampling does not involve simple random sampling.
T F 7. Increasing sample size will eliminate bias in a sample.
T F 8. A placebo is designed to be identical in appearance to the treatment of
interest, but contains no active ingredients.
T F 9. A study is an observational study if the investigator observes the behavior
of a response variable after one or more factors have been manipulated.
T F 10. In a well-designed experiment the treatments are confounded with other
variables whenever possible.
Chapter 1, Concept Quiz
Page 1 of 2
, Chapter 1: Collecting Data in Reasonable Ways
Concept Quiz (Cont'd)
T F 11. If the sample size is small relative to the population size, there is little
practical difference in the results of sampling with replacement and
sampling without replacement.
T F 12. A treatment is a particular combination of values for the explanatory
variables.
T F 13. Variables are extraneous if their effects on the response variable cannot be
distinguished from one another.
T F 14. Random assignment to treatments will guarantee that treatment groups are
exactly alike for experimental purposes.
T F 15. The method of control wherein an extraneous variable is held constant is
called blocking.
T F 16. Random subpopulations of a population are called strata.
T F 17. A control group provides a baseline for comparison with a treatment
group.
T F 18. Random assignment of volunteers to treatments will, on average, result in
comparable experimental groups.
T F 19. If the subjects as well as the person measuring the response are aware of
the treatment assigned to the subject, only single-blinding is being used.
Chapter 1, Concept Quiz
Page 2 of 2
, Chapter 1, Concept Quiz Answer Key
1. F
2. F
3. T
4. F
5. T
6. F
7. F
8. T
9. F
10. F
11. T
12. T
13. F
14. F
15. F
16. F
17. T
18. T
19. F
Chapter 1, Concept Quiz Answer Key Page 1 of 1
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