WGU D772 OA EXAM SCRIPT COMPLETE
QUESTIONS AND CORRECT ANSWERS
GRADED A+
◉ Cluster (Example)
Answer: A researcher studying the opinions of high school
students in a state might randomly select five schools and survey
all students within those schools.
◉ Systematic sampling
Answer: involves selecting every "nth" individual from a list of the
population, starting from a randomly chosen point. This method is
often used when it's easy to access a list of the entire population.
It's a simple and efficient method
◉ Sampling Interval
Answer: The fixed distance between the selected elements in a
systematic sample.
◉ Sampling Interval (Example)
Answer: In a list of 1000 people, if you want a sample of 100, the
sampling interval would be 10 (every 10th person is selected)
◉ Observational Studies
,Answer: researchers observe and record data on variables as they
naturally occur, without any intervention or manipulation
◉ Observational Studies (Example)
Answer: A researcher observes and records the eating habits and
weight of a group of individuals over a year to see if there is a
relationship between diet and weight gain.
◉ Sample Surveys
Answer: a specific type of observational study where individuals
self-report the values of variables, often by providing their
opinions or answering questions. Surveys are commonly used to
gather information about attitudes, beliefs, behaviors, and
demographics.
◉ Sample Surveys (Example)
Answer: Researchers select a random sample of 1,750 U.S. eligible
voters and collect data on their opinions regarding their political
preferences.
◉ Experiments
Answer: researchers intentionally manipulate one or more
variables (the explanatory variables) to observe their effect on
another variable (the response variable). Participants are
randomly assigned to different groups, with each group receiving
a different treatment or level of the explanatory variable.
, ◉ Experiments (Example)
Answer: A researcher randomly assigns participants to two
groups: one group receives a new drug for high blood pressure,
while the other group receives an inactive treatment, also known
as a placebo. The researcher then compares the blood pressure
readings of the two groups to determine if the drug is effective.
◉ Explanatory variable
Answer: variable believed to cause the change
◉ The variable that is affected is called
Answer: Response variable
◉ The different values of the explanatory variable are called
Answer: Treatments
◉ A single object or individual being measured is called
Answer: Experimental unit
◉ Randomization
Answer: helps distribute potential confounding variables equally
across groups, allowing researchers to isolate the effect of the
manipulated variable
QUESTIONS AND CORRECT ANSWERS
GRADED A+
◉ Cluster (Example)
Answer: A researcher studying the opinions of high school
students in a state might randomly select five schools and survey
all students within those schools.
◉ Systematic sampling
Answer: involves selecting every "nth" individual from a list of the
population, starting from a randomly chosen point. This method is
often used when it's easy to access a list of the entire population.
It's a simple and efficient method
◉ Sampling Interval
Answer: The fixed distance between the selected elements in a
systematic sample.
◉ Sampling Interval (Example)
Answer: In a list of 1000 people, if you want a sample of 100, the
sampling interval would be 10 (every 10th person is selected)
◉ Observational Studies
,Answer: researchers observe and record data on variables as they
naturally occur, without any intervention or manipulation
◉ Observational Studies (Example)
Answer: A researcher observes and records the eating habits and
weight of a group of individuals over a year to see if there is a
relationship between diet and weight gain.
◉ Sample Surveys
Answer: a specific type of observational study where individuals
self-report the values of variables, often by providing their
opinions or answering questions. Surveys are commonly used to
gather information about attitudes, beliefs, behaviors, and
demographics.
◉ Sample Surveys (Example)
Answer: Researchers select a random sample of 1,750 U.S. eligible
voters and collect data on their opinions regarding their political
preferences.
◉ Experiments
Answer: researchers intentionally manipulate one or more
variables (the explanatory variables) to observe their effect on
another variable (the response variable). Participants are
randomly assigned to different groups, with each group receiving
a different treatment or level of the explanatory variable.
, ◉ Experiments (Example)
Answer: A researcher randomly assigns participants to two
groups: one group receives a new drug for high blood pressure,
while the other group receives an inactive treatment, also known
as a placebo. The researcher then compares the blood pressure
readings of the two groups to determine if the drug is effective.
◉ Explanatory variable
Answer: variable believed to cause the change
◉ The variable that is affected is called
Answer: Response variable
◉ The different values of the explanatory variable are called
Answer: Treatments
◉ A single object or individual being measured is called
Answer: Experimental unit
◉ Randomization
Answer: helps distribute potential confounding variables equally
across groups, allowing researchers to isolate the effect of the
manipulated variable
