WGU D207 Data-Driven Decision Making – OA Exam & Study Guide 2025/26 | 500 Verified Questions with Detailed Correct Answers (A+ Graded)

WGU D207 DATA DRIVEN DECISION MAKING OA EXAM
AND STUDY GUIDE LATEST 2024 ACTUAL EXAM 500
QUESTIONS AND CORRECT DETAILED |ALREADY GRADED
A+


A researcher concludes that bananas create healthy children because
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the researcher's notes indicate that children who eat a banana every
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day are healthy.Which misuse of statistics would this study be an
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example of if these children also eat a balanced diet and exercise
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daily?
V




Unfounded assumptions V




Lack of blinding
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Faulty operationalization Confusion of association and causality
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- ANSWER--Confusion of association and causality
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In the month of December, there is a strong positive correlation
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Vbetween airline ticket sales and retail sales.Which question should the
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Vresearcher consider before concluding that the correlation statistic
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Vimplies that airline sales drive retail sales?
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Does a causal relationship truly exist?
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Are the data biased?
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Is the sample size large enough?
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Does the sample accurately reflect the population? - ANSWER--Does
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,a causal relationship truly exist?
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,A medical care provider determines the probability that a patient needs
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treatment for a broken bone, the probability that a patient needs
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treatment for a concussion, and the probability that a patient needs
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treatment for both a broken bone and a concussion.Which two
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techniques apply in finding the probability that a patient needs
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treatment for a broken bone and a concussion?Choose 2 answers.
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Intersection
Union
V




Multiplication principle Mutually exclusive - ANSWER--Intersection
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Multiplication principle V




A hardware store has found that there is a 0.25 probability that a
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customer buys an electrical product, a 0.45 probability that a customer
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buys a plumbing product, and a 0.10 probability that a customer buys
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an electrical product if they purchase a plumbing product.Which
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statistical rule can be used to determine the probability that a
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customer buys a plumbing product given that this customer has
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purchased an electrical product?
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Bayes' theorem V




Multiplication
V




Combination
V

, Conditional probability - ANSWER--Bayes' theorem
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Given the following data set:
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9, 12, 14, 10, 8, 11, 12
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What is the mode? V V V




8
9
11
12 - ANSWER--12
V V




Which graphical tool is used to illustrate a possible relationship or
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correlation between two variables?
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Run chart V




Scatterplot
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Box plot
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Histogram - ANSWER--Scatterplot V V