WGU D204 Exam Questions and

WGU D204 Exam Questions and Answers (100% Correct)

Question :Which of these is NOT a topic of interest for

Discovery/Planning/Business Understanding?

• Project Scope
• Identify stakeholders and research questions/KPIs
• Build a data pipeline (ETL)
• Identify timeline, budget, and participants

Correct answer:C

Question :What is a potential problem to consider in the

planning phase?

• Lack of clear focus on stakeholders, timeline, limitations,

and budget

• Quality and type of data may make access more difficult
• Some cleaning techniques could dramatically change

data/outcomes

• Outliers not dealt with can cause problems with statistical

models due to excessive variability.

Correct answer:A

Question :In what phase does the analyst identify the stake

holders and research questions?

Correct answer:Business Understanding/Planning/Discovery

Question :In what phase does the analyst deal with the

following:

Gather/collect data from a variety of sources Provide structure to data accessible via relational databases (SQL) Build data pipeline (ETL) Use of API to download data from an external source

Correct answer:Data acquisition

Question :In what phase does the analyst deal with the

following:

Fixing improperly formatted values Dealing with duplicates, missing data, and outliers Data reduction

Correct answer:Data cleaning/wrangling/scrubbing/munging

Question :In what phase does the analyst deal with the

following:

Central Tendency/ Measures of center (e.g., mean, median, mode), variability (e.g., standard deviations and quartiles) and distributions (e.g., normal, skewed, etc) Identify basic correlations between variables Pattern discovery

Correct answer:Data exploration/Exploratory Data

Analysis(EDA)/Descriptive Statistics

Question :In what phase does the analyst deal with the

following:

Estimate/project future values or likelihood of an event.Extend correlations found in EDA to mathematical models Predict/determine output values based on input values Cross-validation of predictive models to ensure accuracy.

Correct answer:Predictive Modeling/Data

Modeling/Correlation based models/Regression models/Time Series

Question :In what phase does the analyst deal with the

following:

Creating training and testing datasets to build models from Identify/detect patterns Determine if groups (clusters) exist in data Classify data into groups Create models that "learn" and improve (e.g., machine/deep learning, AI, etc)

Correct answer:Data Mining/Machine

Learning/AI/Supervised, Unsupervised Models

Question :In what phase does the analyst deal with the

following:

Tell a story with data Provide a summary of analytic analysis Provide insights to stakeholders