7/12/25, 10:06 PM D772 OA Practice Test
WGU D772 OA Practice Test | 82 Taken by: Wiseman
Study Questions and Answers 100% Score
1. Describe the role of the explanatory variable in the context of the maze
experiment conducted by the psychologist.
The explanatory variable is the size of the maze, which remains
constant throughout the experiment.
The explanatory variable is the time taken to solve the maze, which is
measured after the experiment.
The explanatory variable is the specific maze color, which is
manipulated to observe its effect on the participants' performance.
The explanatory variable is the number of groups, which determines
how many participants are tested.
2. What is the term used to describe the bias that occurs when individuals
selected for a survey do not respond?
Loaded question
Self-interest study
Perceived lack of anonymity
Non-response bias
3. Researchers believed that floral scent can sometimes improve a person's
learning ability. They set up an experiment in which each of 22 subjects
completed sets of mazes. Each subject wore a floral-scented mask and an
unscented mask in random order. The researchers measured the time to
complete the sets of mazes. What is the explanatory variable (factor)?
presence or absence of the floral scent
the time to complete the pencil-and-paper mazes
,7/12/25, 10:06 PM D772 OA Practice Test
whether the subject was able to complete the mazes quicker while
wearing the floral-scented mask
the amount of scent
4. An epidemiologist is collecting data during a community survey. The data
includes counts of gender and race. How should these variables (gender and
race) be classified?
Numerical, Continuous
Numerical, Discrete
Categorical, Ordinal
Categorical, Nominal
5. Describe how non-response bias can affect the validity of survey results.
Non-response bias has no effect on survey results.
Non-response bias can skew the results because the opinions of
those who did not respond may differ significantly from those who
did.
Non-response bias is only a concern in online surveys.
Non-response bias only affects qualitative data.
6. Nick wants to study the effect of violent media on children. To do this, he
designs an experiment in which children are randomly assigned to either view
a violent movie or a non-violent movie, and then Nick measures the children's
aggressive behaviors. What method of research is this?
Survey
Content analysis
Meta-analysis
, 7/12/25, 10:06 PM D772 OA Practice Test
Experiment
Triangulation
7. In a true experiment, what does the researcher do?
Manipulates an independent variable and measures the outcome on a
dependent variable
Attempts to control extraneous factors
Seeks to determine causality
All of the above
8. Which of the following is an example of an individual in a clinical study?
A patient who is part of the study
The average temperature of participants
A group of randomly selected participants
The overall results of the study
9. A teacher notices that whenever she brings chocolate chip cookies to her
class, the test scores improve. She concludes that cookies increase students'
scores on this test. This conclusion may be incorrect because
the sample is not representative of the population
this is correlational, not causational, relationship
the dependent variable is not operationally defined.
the test was not double blind
the independent variable was not manipulated
WGU D772 OA Practice Test | 82 Taken by: Wiseman
Study Questions and Answers 100% Score
1. Describe the role of the explanatory variable in the context of the maze
experiment conducted by the psychologist.
The explanatory variable is the size of the maze, which remains
constant throughout the experiment.
The explanatory variable is the time taken to solve the maze, which is
measured after the experiment.
The explanatory variable is the specific maze color, which is
manipulated to observe its effect on the participants' performance.
The explanatory variable is the number of groups, which determines
how many participants are tested.
2. What is the term used to describe the bias that occurs when individuals
selected for a survey do not respond?
Loaded question
Self-interest study
Perceived lack of anonymity
Non-response bias
3. Researchers believed that floral scent can sometimes improve a person's
learning ability. They set up an experiment in which each of 22 subjects
completed sets of mazes. Each subject wore a floral-scented mask and an
unscented mask in random order. The researchers measured the time to
complete the sets of mazes. What is the explanatory variable (factor)?
presence or absence of the floral scent
the time to complete the pencil-and-paper mazes
,7/12/25, 10:06 PM D772 OA Practice Test
whether the subject was able to complete the mazes quicker while
wearing the floral-scented mask
the amount of scent
4. An epidemiologist is collecting data during a community survey. The data
includes counts of gender and race. How should these variables (gender and
race) be classified?
Numerical, Continuous
Numerical, Discrete
Categorical, Ordinal
Categorical, Nominal
5. Describe how non-response bias can affect the validity of survey results.
Non-response bias has no effect on survey results.
Non-response bias can skew the results because the opinions of
those who did not respond may differ significantly from those who
did.
Non-response bias is only a concern in online surveys.
Non-response bias only affects qualitative data.
6. Nick wants to study the effect of violent media on children. To do this, he
designs an experiment in which children are randomly assigned to either view
a violent movie or a non-violent movie, and then Nick measures the children's
aggressive behaviors. What method of research is this?
Survey
Content analysis
Meta-analysis
, 7/12/25, 10:06 PM D772 OA Practice Test
Experiment
Triangulation
7. In a true experiment, what does the researcher do?
Manipulates an independent variable and measures the outcome on a
dependent variable
Attempts to control extraneous factors
Seeks to determine causality
All of the above
8. Which of the following is an example of an individual in a clinical study?
A patient who is part of the study
The average temperature of participants
A group of randomly selected participants
The overall results of the study
9. A teacher notices that whenever she brings chocolate chip cookies to her
class, the test scores improve. She concludes that cookies increase students'
scores on this test. This conclusion may be incorrect because
the sample is not representative of the population
this is correlational, not causational, relationship
the dependent variable is not operationally defined.
the test was not double blind
the independent variable was not manipulated
