EMC Dell Data Science Foundations - D-DS-FN-23 Exam Practice Test
Refer to the exhibit.
What is the approximate R-squared value for a linear regression model fitted to the data associated with this scatterplot?
What is the approximate R-squared value for a linear regression model fitted to the data associated with this scatterplot?
Correct Answer: A
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Which phase of the data analytic lifecycle includes conducting project sponsor interviews and drafting a problem statement?
Correct Answer: C
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A time series of monthly sales indicates a periodic pattern, and the value reaches the peak every December.
Which statistic needs to be subtracted from the actual value to adjust for this seasonal effect?
Which statistic needs to be subtracted from the actual value to adjust for this seasonal effect?
Correct Answer: D
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Refer to the exhibit, which shows pairwise counts for items purchased together.
Consider the following association rule: Milk -> Eggs
What is value of the lift?
Correct Answer: A
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When would you use GROUP BY ROLLUP clause in your OLAP query?
Correct Answer: D
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After which phase of the data analytics lifecycle should you determine if the model is robust enough?
Correct Answer: C
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Your colleague, who is new to Hadoop, approaches you with a question. They want to know how best to access their data. This colleague has a strong background in data flow languages and programming.
Which query interface would you recommend?
Which query interface would you recommend?
Correct Answer: B
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In which lifecycle stage are appropriate analytical techniques determined?
Correct Answer: D
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In addition to the business question and descriptions of available data sets, what else would an analytic plan include?
Correct Answer: A
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