D204 WGU Study Guides

Which of these is NOT a topic of interest for Discovery/Planning/Business Understanding? A. Project Scope B. Identify stakeholders and research questions/KPIs C. Build a data pipeline (ETL) D. Identify timeline, budget, and participants - Answer- C What is a potential problem to consider in the planning phase? A. Lack of clear focus on stakeholders, timeline, limitations, and budget B. Quality and type of data may make access more difficult C. Some cleaning techniques could dramatically change data/outcomes D. Outliers not dealt with can cause problems with statistical models due to excessive variability. - Answer- A In what phase does the analyst identify the stake holders and research questions? - Answer- Business Understanding/Planning/Discovery 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 - Answer- Data acquisition In what phase does the analyst deal with the following: Fixing improperly formatted values Dealing with duplicates, missing data, and outliers Data reduction - Answer- Data cleaning/wrangling/scrubbing/munging 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 - Answer- Data exploration/Exploratory Data Analysis(EDA)/Descriptive Statistics 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-validatio