WGU C955 applied probability and statistics Test Exam Review Questions with all Answers verified for accuracy Updated 2024/2025
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WGU C955
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WGU C955
WGU C955 applied probability and statistics Test Exam Review Questions with all Answers verified for accuracy Updated 2024/2025
Only way to prove causation - correct answer Experiments, because they account for lurking variables
Observational study - correct answer A type of study where we me...
WGU C955 applied probability and statistics
Test Exam Review Questions with all Answers
verified for accuracy Updated 2024/2025
Only way to prove causation - correct answer Experiments,
because they account for lurking variables
Observational study - correct answer A type of study where
we measure or survey members of a sample without trying to
affect them. Cannot prove causation.
Experimental study - correct answer A study where you split
subjects up randomly and impose a change on one group to study
the effect; can prove causation
Prospective study - correct answer Is a study that's done over
time to find results / A study watching for outcomes during the
study period
Retrospective study - correct answer A study that looks
backwards to assess outcomes and possible causes after the fact
Control group - correct answer randomly assign people or
things to groups. One group receives a treatment and the other
group does not. This is the group that does not receive treatment
Placebo - correct answer A substance or procedure that has
no effect used for comparison to the real substance or procedure
,Placebo effect - correct answer A beneficial effect produced
by the belief of the patient/subject, not by the intervention itself.
Experimenter effect - correct answer When the persons
running an experiment affects its results by influencing the
subjects inadvertently
Open question - correct answer A question that gives the
responder freedom to answer in many different ways -- harder to
analyze with statistics.
Closed question - correct answer A question with limited
choices, e.g. multiple choice or yes/no. Easier to analyze
statistically.
Unbalanced response - correct answer Giving more options
that are negative than positive options (or vice versa) which
biases the responses towards the more common option
Matched pairs - correct answer Grouping two similar subjects
and giving different treatments/procedures to each in order to
compare the differences. For example, having one twin take a
medication while the other twin does not.
Blind experimental study - correct answer When information
of a study isn't revealed to the participants
, Double Blind Study - correct answer When information of
study is hidden from the researcher and the participant.
Population - correct answer The entire group you are trying
to describe or understand.
Sampling frame - correct answer List of group from which
you choose your sample.
Sample - correct answer The group that is actually picked to
be included in a study
Simple random sample - correct answer making a selection
by following a random pattern and selecting without
replacement. Unbiased.
Systematic sample - correct answer Sample is selected by
listing the sampling frame, then making a selection by following
a simple pattern (eg. Every 20th name). Unbiased.
Voluntary sample - correct answer Members of the sample
may choose not to respond. Similar to Non Response.
Convenience sample - correct answer Participants are easy
for researcher to access. Tends to increase bias.
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