WGU C207 DATA DRIVEN DECISION
MAKING 2026 EXAM QUESTIONS AND
CORRECT ANSWERS A+ STUDY GUIDE OA
PRACTICE TEST
Statistics - CORRECT ANSWER-The science that deals with the
interpretation of numerical facts or data through theories of probability.
Also, the numerical facts or data themselves.
Systematic Errors - CORRECT ANSWER-Errors in measurement that are
constant within a data set, sometimes caused by faulty equipment or bias
test statistic - CORRECT ANSWER-One value used to test the hypothesis,
it is a numerical summary of the data set
The Result Chain - CORRECT ANSWER-1) Resources - inputs and
activities 2) Results - outputs then outcomes then impact
Time Series Analysis - CORRECT ANSWER-Regression analysis that uses
time as the independent variable
Trend - CORRECT ANSWER-In data analysis, a general slope upward or
downward over a long period of time
,Trial - CORRECT ANSWER-An experiment, a test of the performance or
qualities of something or someone
Triple Blind Study - CORRECT ANSWER-A study performed where
neither the treatment allocator nor the participant nor the response
gatherer knows which group the participant is in
True Score Model - CORRECT ANSWER-average score an individual
would achieve if he or she were to take the test infinite times; observed
score is the true score plus random error
Upper control limit - CORRECT ANSWER-The maximum value on a
control chart that a process should not exceed
Valid Data - CORRECT ANSWER-Data resulting from a test that
accurately measures what it is intended to measure
Variance - CORRECT ANSWER-The average of the squared differences
from the mean of the related sample
Weighted Composite Index - CORRECT ANSWER-created when a
researcher applies more weight to certain goods or services than others as
they are calculating the index number
Z-score - CORRECT ANSWER-A statistical measure that indicates the
number of standard deviations a data point is from its mean
,Pareto chart - CORRECT ANSWER-A bar chart that sorts data into
categories, then prioritizes those categories to help project teams identify
the most significant factors or the biggest contributors to problems.
80/20 rule - CORRECT ANSWER-states that 80% of quality management
problems are the result of a small number - about 20% - of causes
expected value - CORRECT ANSWER-a random variable is intuitively the
long-run average value of repetitions of the experiment it represents
cohort study - CORRECT ANSWER-A study that observes and follows
people moving forward in time from the time of their entry into the study.
linear programming - CORRECT ANSWER-A mathematical tool used to
optimize a function (the objective function) subject to various constraints,
all of which are linear. Often used to find the combination of products that
will maximize profits or minimize costs.
correlation - CORRECT ANSWER-The extent or degree of statistical
association among two or more variables.
response bias - CORRECT ANSWER-This misuse occurs when the
respondents to a survey say what they believe the questioner wants to hear.
This bias can occur as a result of the wording of a question.
, Association and causality - CORRECT ANSWER-This statistical misuse
occurs when a researcher notices a relationship between two variables and
assumes that one variable is the cause of the other. In reality, these
variables might both be caused by a separate variable. In this case, they
would merely be correlated, which means they show up together. Or there
might be no relationship at all.
operationalization - CORRECT ANSWER-refers to the development of
specific research procedures that allow for observation and measurement of
abstract concepts
conscious bias - CORRECT ANSWER-occurs when the surveyor is actively
seeking a certain response to support his or her theory or cause
Bayes' Theorem - CORRECT ANSWER-A formula that calculates
conditional probabilities, important in understanding how new information
affects the probabilities of different outcomes.
conditional probability - CORRECT ANSWER-the probability of an event
occurring given that another event has occurred
Chi-square test - CORRECT ANSWER-any statistical hypothesis test in
which the sampling distribution of the test statistic is a chi-square
distribution when the null hypothesis is true
Plan Do Check Act Cycle - CORRECT ANSWER-A four-step method that
practitioners use to create plans to solve a problem (Plan), run an
MAKING 2026 EXAM QUESTIONS AND
CORRECT ANSWERS A+ STUDY GUIDE OA
PRACTICE TEST
Statistics - CORRECT ANSWER-The science that deals with the
interpretation of numerical facts or data through theories of probability.
Also, the numerical facts or data themselves.
Systematic Errors - CORRECT ANSWER-Errors in measurement that are
constant within a data set, sometimes caused by faulty equipment or bias
test statistic - CORRECT ANSWER-One value used to test the hypothesis,
it is a numerical summary of the data set
The Result Chain - CORRECT ANSWER-1) Resources - inputs and
activities 2) Results - outputs then outcomes then impact
Time Series Analysis - CORRECT ANSWER-Regression analysis that uses
time as the independent variable
Trend - CORRECT ANSWER-In data analysis, a general slope upward or
downward over a long period of time
,Trial - CORRECT ANSWER-An experiment, a test of the performance or
qualities of something or someone
Triple Blind Study - CORRECT ANSWER-A study performed where
neither the treatment allocator nor the participant nor the response
gatherer knows which group the participant is in
True Score Model - CORRECT ANSWER-average score an individual
would achieve if he or she were to take the test infinite times; observed
score is the true score plus random error
Upper control limit - CORRECT ANSWER-The maximum value on a
control chart that a process should not exceed
Valid Data - CORRECT ANSWER-Data resulting from a test that
accurately measures what it is intended to measure
Variance - CORRECT ANSWER-The average of the squared differences
from the mean of the related sample
Weighted Composite Index - CORRECT ANSWER-created when a
researcher applies more weight to certain goods or services than others as
they are calculating the index number
Z-score - CORRECT ANSWER-A statistical measure that indicates the
number of standard deviations a data point is from its mean
,Pareto chart - CORRECT ANSWER-A bar chart that sorts data into
categories, then prioritizes those categories to help project teams identify
the most significant factors or the biggest contributors to problems.
80/20 rule - CORRECT ANSWER-states that 80% of quality management
problems are the result of a small number - about 20% - of causes
expected value - CORRECT ANSWER-a random variable is intuitively the
long-run average value of repetitions of the experiment it represents
cohort study - CORRECT ANSWER-A study that observes and follows
people moving forward in time from the time of their entry into the study.
linear programming - CORRECT ANSWER-A mathematical tool used to
optimize a function (the objective function) subject to various constraints,
all of which are linear. Often used to find the combination of products that
will maximize profits or minimize costs.
correlation - CORRECT ANSWER-The extent or degree of statistical
association among two or more variables.
response bias - CORRECT ANSWER-This misuse occurs when the
respondents to a survey say what they believe the questioner wants to hear.
This bias can occur as a result of the wording of a question.
, Association and causality - CORRECT ANSWER-This statistical misuse
occurs when a researcher notices a relationship between two variables and
assumes that one variable is the cause of the other. In reality, these
variables might both be caused by a separate variable. In this case, they
would merely be correlated, which means they show up together. Or there
might be no relationship at all.
operationalization - CORRECT ANSWER-refers to the development of
specific research procedures that allow for observation and measurement of
abstract concepts
conscious bias - CORRECT ANSWER-occurs when the surveyor is actively
seeking a certain response to support his or her theory or cause
Bayes' Theorem - CORRECT ANSWER-A formula that calculates
conditional probabilities, important in understanding how new information
affects the probabilities of different outcomes.
conditional probability - CORRECT ANSWER-the probability of an event
occurring given that another event has occurred
Chi-square test - CORRECT ANSWER-any statistical hypothesis test in
which the sampling distribution of the test statistic is a chi-square
distribution when the null hypothesis is true
Plan Do Check Act Cycle - CORRECT ANSWER-A four-step method that
practitioners use to create plans to solve a problem (Plan), run an
