WGU C955 EXAM |APPLIED PROBABILITY AND STATISTICS EXAM STUDY GUIDE | LATEST 2024/2025
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Course
WGU C955
Institution
WGU C955
WGU C955 EXAM |APPLIED PROBABILITY AND STATISTICS EXAM STUDY GUIDE | LATEST 2024/2025
WGU C955 EXAM |APPLIED PROBABILITY AND STATISTICS EXAM STUDY GUIDE | LATEST 2024/2025
WGU C955 EXAM |APPLIED PROBABILITY AND
STATISTICS EXAM STUDY GUIDE | LATEST
2024/2025
Sampling Methods - Correct Answer - The investigative research process
has four main steps:
Identify a question or problem.
Collect relevant data on the topic.
Analyze the data.
Form a conclusion.
Population - Correct Answer - All subjects in the study which have the
characteristics being evaluated
Sample - Correct Answer - The subset of the study population that is
being studied
representative sample - Correct Answer - A subset of the population with
similar characteristics to the entire population
Sampling Frame - Correct Answer - The list of all people or things that
may be included in the statistical study
Sampling method - Correct Answer - The technique used to select people
within the sampling frame
,simple random sampling - Correct Answer - A sampling procedure in
which each member of the population has an equal probability of being
included in the sample.
voluntary sample - Correct Answer - Researchers invite everyone in the
sampling frame to participate. Individuals who voluntarily respond comprise
the study sample.
Stratified sample - Correct Answer - Researchers break up the population
into separate and distinct categories to obtain the study sample
Cluster Sample - Correct Answer - Similar to stratified sample, but
researchers select entire chunks or clusters of the population to obtain the
study sample.
observational study - Correct Answer - The researcher observes if there
is an association between variable. There is no treatment or control group
Experimental study - Correct Answer - The researcher applies a
treatment to one group and no treatment (or placebo) to a control group, to
determine if there is causation between variables
bias - Correct Answer - occurs when a method of collecting data
influences the results of a study. There are several ways bias can be
introduced into a study, but in this course we will focus on bias resulting
from misalignment between the question, population, sampling frame, and
sampling method
, Association - Correct Answer - The presence of a relationship between
two variable usually noted through observation
Causation - Correct Answer - The result of cause and effect
Casual Relationship - Correct Answer - A relationship between two
variables that can be classified as cause-and-effect
Causation - Correct Answer - Can only be determined from an
experiment
Lurking Variable - Correct Answer - A variable that is not included in an
analysis but that is related to two (or more) other associated variables
which were analyzed
Simpson's Paradox - Correct Answer - A counterintuitive situation in
which a trend in different groups of data disappears or reverses when the
groups are combined.
Regression Analysis - Correct Answer - A statistical analysis tool that
quantifies the relationship between a response variable and one or more
expanatory variable
regression equation - Correct Answer - the algebraic equation that
models the regression
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