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D204 Test 2023 # 115 Complete Questions & Answers.
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D204 Test 2023 # 115 Complete Questions &Answers.
What are the 7 steps of the data analytics journey? - -
Business Understanding (Discovery Phase)
Data Acquisition (Data Collecting)
Data Cleaning
Data Exploration
Predictive Modelling
Data Mining
Reporting & Visualization
-Define: discovery phase - -Analyst defines the major questions of interest that need to
be answered, needs of the stakeholders and assesses the resource constraints of the
project
-Define: data acquisition (data collecting) - -Frequently retrieved from a database
-What can an analyst do if data is not available? - -use tools like web scraping or
surveys to get it.
-What happens if the data cleaning step is ignored? - -The results from the analysis
become irrelevant
-What tools are used for data cleansing? - -SQL, Python, R, Excel
-What is data quality measured in terms of? (2) - -uniqueness, relevance
-Define: Data Exploration - -The analyst begins to understand the basic nature of data
and the relationships within it
-What does data exploration rely on? (2) - -Use of data visualization tools and
numerical summaries
-Define: Predictive Modeling - -Allow the analyst to move beyond describing the data
to creating models that enable predictions of outcomes of interest
-What tools are used for predictive modeling? - -Python, R
-What tools became popular with the ability of computers to look for patterns in large
amounts of data? - -Data Mining Tools. Python, R
-What is the last step of the data analytics journey? - -Reporting and Visualization
, -What is the first step of the data analytics journey? - -Discovery Phase / Business
Understanding
-What is the second step of the data analytics journey? - -Data Acquisition / Data
Collecting
-What is the third step of the data analytics journey? - -Data Cleaning / Data
Wrangling / Feature Engineering / Data Munging
-What is the fourth step of the data analytics journey? - -Data Exploration
-What is the fifth step of the data analytics journey? - -Predictive Modeling
-What is the sixth step of the data analytics journey? - -Data Mining
-What tools are used for reporting and visualization? - -Tableau
-What are the goals of the reporting and visualization phase? - -To provide actionable
insights for various stakeholders
-Define: Reporting & Visualization - -The analyst tells the story of the data and uses
graphs or interactive dashboards to inform others of the findings from the analyses
-Data analysis is often seen as a combination of ______ and ______. - -Value &
Difficulty
-What are the four types of analytics? - -Descriptive
Diagnostic
Predictive
Prescriptive
-What is the main question that descriptive analytics aims to answer? - -What
happened?
-What is the main question that diagnostic analytics aims to answer? - -Why did it
happen?
-What is the main question that predictive analytics aims to answer? - -What will
happen in the future?
-What is the main question that prescriptive analytics aims to answer? - -How can we
make it happen? How can we change it? What action will achieve a particular outcome?
-T/F: Correlation does not imply Causation. - -True
-T/F: In data analytics, it is harder to show correctional results. - -False. It is easier to
show correctional results.
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