For a survey to find the average time students spend using the library at your school, use a

C) stratified random sample with grade level as the strata.

To test the effectiveness of a new SAT prep course, which experimental design is best?

D) A randomized block design using PSAT score as the blocks

Which of the following statements about bias is true? Bias...

B) produces samples that do not represent the population.

Which of the following distinguishes an observational study from an experiment? In an obs study

C) treatments are not randomly assigned.

Viewers with strong opinions about a current issue responding to a poll by a local news station

A) is an example of voluntary response bias.

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Sampling and Experimental Design

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10 multiple choice questions about sampling design and experimental design

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Questions 10

Answers

1
For a survey to find the average time students spend using the library at your school, use a
D) cluster sample with grade level as the clusters.
A) simple random sample.
B) stratified random sample with gender as the strata.
C) stratified random sample with grade level as the strata.
2
In an experiment the primary purpose of blinding is to reduce...
B) confounding.
D) undercoverage.
C) randomness.
A) bias.
3
To test the effectiveness of a new SAT prep course, which experimental design is best?
D) A randomized block design using PSAT score as the blocks
C) A randomized block design using gender as the blocks
B) A randomized block design using student GPA as the blocks
A) A completely randomized design
4
A well-designed experiment should have which of the following characteristic(s)?
C) Replication.
B) A control group or at least two treatment groups.
A) Subjects assigned randomly to treatments.
D) All of these.
5
Which of the following statements about bias is true? Bias...
C) is usually reduced when the sample size is larger.
D) All of these.
A) results from random variation and will always be present.
B) produces samples that do not represent the population.
6
Which of the following distinguishes an observational study from an experiment? In an obs study
D) a control group is never used.
C) treatments are not randomly assigned.
B) a random sample is always taken.
A) volunteers are always used.
7
Which is the best way to compare the average ages of math and science teachers at your school?
C) Do an observational study.
A) Take a census.
B) Use a sample survey.
D) Perform an experiment.
8
Viewers with strong opinions about a current issue responding to a poll by a local news station
D) is an example of response bias.
A) is an example of voluntary response bias.
C) is an example of undercoverage bias.
B) is an example of nonresponse bias.
9
Which is the best way to collect data on the ease of using a new Internet search engine?
C) observational study
D) experiment
A) census
B) sample survey
10
Placebos are a tool for...
A) sampling
B) blocking
D) control
C) blinding

Sampling and Experimental Design Flashcards | StudBud