Latest 2026/2027 WGU Data Driven Decision Making Pre
Assessment exam with correct answers
When conducting a study that measures an individual's weight, all scales are calibrated
prior to use in measurement.
Which type of error should this procedure significantly reduce? -correct answer
>>>Systematic error
An advertising manager creates a research study by presenting low, medium or high
frequency of the same ad in matched markets. The manager then reports on sales in
each market location.
What is the term for the different sales in this study? -correct answer >>>Response
variable
Healthcare study follows a particular sample over time to identify how the health habits
of teenagers impact their likelihood of acquiring various diseases later in their life. The
healthcare org hopes the data will allow them to create early prevention programs.
Which type of research design does this study describe? -correct answer >>>Cohort
study
Several missing values in a particular field in a dataset were observed. The likelihood of
a record having a missing value is correlated to another variable in the dataset.
Which two types of error might be introduced into the dataset if the removed record
included missing values? -correct answer >>>Systematic error
Omission error
A company is trying to increase online sales revenue by improving its email advertising
campaign for repeat customers as well as new customers.
Which two variables would be used in determining a campaign to maximize revenue
gain? -correct answer >>>Number of purchases per email
Spending per purchase
A company that raises turkeys hopes to increase the rate of growth while controlling the
cost of feeding them. It has determined that feeds containing both nutrients and proteins
can be used.
Which decision-making technique is most appropriate to minimize the cost of feeding
the birds? -correct answer >>>Linear programming
Comparing outcomes of different drug testing results -correct answer >>>ANOVA
Understand effective marketing to spend advertising dollars efficiently -correct answer
>>>Correlation
Monitor production process -correct answer >>>Control charts
, A researcher concludes that bananas create healthy children because the researcher's
notes indicate that children who eat a banana every day are healthy.
Which misuse of statistics would this study be an example of if these children also eat a
balanced diet and exercise daily? -correct answer >>>Confusion of association and
causality
In the month of December, there is a strong positive correlation between airline ticket
sales and retail sales.
Which question should the researcher consider before concluding that the correlation
statistic implies that airline sales drive retail sales? -correct answer >>>Does a causal
relationship truly exist?
A medical care provider determines the probability that a patient needs treatment for a
broken bone, the probability that a patient needs treatment for a concussion, and the
probability that a patient needs treatment for both a broken bone and a concussion.
Which two techniques apply in finding the probability that a patient needs treatment for
a broken bone and a concussion? -correct answer >>>Intersection
Multiplication principle
A hardware store has found that there is a 0.25 probability that a customer buys an
electrical product, a 0.45 probability that a customer buys a plumbing product, and a
0.10 probability that a customer buys an electrical product if they purchase a plumbing
product.
Which statistical rule can be used to determine the probability that a customer buys a
plumbing product given that this customer has purchased an electrical product? -correct
answer >>>Bayes' theorem
Given the following data set:
9, 12, 14, 10, 8, 11, 12
What is the mode? -correct answer >>>12
Which graphical tool is used to illustrate a possible relationship or correlation between
two variables? -correct answer >>>Scatterplot
What does it mean when an individual data point has a z-score of -2? -correct answer
>>>The data point is two standard deviations less than the mean of the data set.
Assessment exam with correct answers
When conducting a study that measures an individual's weight, all scales are calibrated
prior to use in measurement.
Which type of error should this procedure significantly reduce? -correct answer
>>>Systematic error
An advertising manager creates a research study by presenting low, medium or high
frequency of the same ad in matched markets. The manager then reports on sales in
each market location.
What is the term for the different sales in this study? -correct answer >>>Response
variable
Healthcare study follows a particular sample over time to identify how the health habits
of teenagers impact their likelihood of acquiring various diseases later in their life. The
healthcare org hopes the data will allow them to create early prevention programs.
Which type of research design does this study describe? -correct answer >>>Cohort
study
Several missing values in a particular field in a dataset were observed. The likelihood of
a record having a missing value is correlated to another variable in the dataset.
Which two types of error might be introduced into the dataset if the removed record
included missing values? -correct answer >>>Systematic error
Omission error
A company is trying to increase online sales revenue by improving its email advertising
campaign for repeat customers as well as new customers.
Which two variables would be used in determining a campaign to maximize revenue
gain? -correct answer >>>Number of purchases per email
Spending per purchase
A company that raises turkeys hopes to increase the rate of growth while controlling the
cost of feeding them. It has determined that feeds containing both nutrients and proteins
can be used.
Which decision-making technique is most appropriate to minimize the cost of feeding
the birds? -correct answer >>>Linear programming
Comparing outcomes of different drug testing results -correct answer >>>ANOVA
Understand effective marketing to spend advertising dollars efficiently -correct answer
>>>Correlation
Monitor production process -correct answer >>>Control charts
, A researcher concludes that bananas create healthy children because the researcher's
notes indicate that children who eat a banana every day are healthy.
Which misuse of statistics would this study be an example of if these children also eat a
balanced diet and exercise daily? -correct answer >>>Confusion of association and
causality
In the month of December, there is a strong positive correlation between airline ticket
sales and retail sales.
Which question should the researcher consider before concluding that the correlation
statistic implies that airline sales drive retail sales? -correct answer >>>Does a causal
relationship truly exist?
A medical care provider determines the probability that a patient needs treatment for a
broken bone, the probability that a patient needs treatment for a concussion, and the
probability that a patient needs treatment for both a broken bone and a concussion.
Which two techniques apply in finding the probability that a patient needs treatment for
a broken bone and a concussion? -correct answer >>>Intersection
Multiplication principle
A hardware store has found that there is a 0.25 probability that a customer buys an
electrical product, a 0.45 probability that a customer buys a plumbing product, and a
0.10 probability that a customer buys an electrical product if they purchase a plumbing
product.
Which statistical rule can be used to determine the probability that a customer buys a
plumbing product given that this customer has purchased an electrical product? -correct
answer >>>Bayes' theorem
Given the following data set:
9, 12, 14, 10, 8, 11, 12
What is the mode? -correct answer >>>12
Which graphical tool is used to illustrate a possible relationship or correlation between
two variables? -correct answer >>>Scatterplot
What does it mean when an individual data point has a z-score of -2? -correct answer
>>>The data point is two standard deviations less than the mean of the data set.
