EMC D-DS-FN-23 Actual Free Exam Questions & Community Discussion
How are window functions different from regular aggregate functions?
Correct Answer: C
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What is the output of the K-means clustering algorithm?
Correct Answer: A
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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: D
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A data scientist is asked to implement an article recommendation feature for an online magazine. The magazine does not want to use client tracking technologies such as cookies or reading history.
Therefore, only the style and subject matter of the current article is available for making recommendations.
All of the magazine's articles are stored in a database in a format suitable for analytics.
Which method should the data scientist try first?
Therefore, only the style and subject matter of the current article is available for making recommendations.
All of the magazine's articles are stored in a database in a format suitable for analytics.
Which method should the data scientist try first?
Correct Answer: B
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What activities occur during the discovery phase of the data analytics lifecycle?
Correct Answer: D
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What tasks need to be completed when designing an analytic sandbox?
Correct Answer: B
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In the Map Reduce framework, what is the purpose of the Map Function?
Correct Answer: A
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Refer to the exhibit.
After analyzing a dataset, you report findings to your team:
1. Variables A and C are significantly and positively impacting the dependent variable.
2. Variable B is significantly and negatively impacting the dependent variable.
3. Variable D is not significantly impacting the dependent variable.
After seeing your findings, the majority of your team agreed that variable B should be positively impacting the dependent variable.
What is a possible reason the coefficient for variable B was negative and not positive?
After analyzing a dataset, you report findings to your team:
1. Variables A and C are significantly and positively impacting the dependent variable.
2. Variable B is significantly and negatively impacting the dependent variable.
3. Variable D is not significantly impacting the dependent variable.
After seeing your findings, the majority of your team agreed that variable B should be positively impacting the dependent variable.
What is a possible reason the coefficient for variable B was negative and not positive?
Correct Answer: D
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Which chart type is the most effective way to show trends over time?
Correct Answer: C
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In which phase of the analytic lifecycle would you expect to spend most of the project time?
Correct Answer: D
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Which graphical representation shows the distribution and multiple summary statistics of a continuous variable for each value of a corresponding discrete variable?
Correct Answer: B
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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 previously worked extensively with SQL and databases.
Which query interface would you recommend?
Which query interface would you recommend?
Correct Answer: C
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Consider these itemsets:
(hat, scarf, coat)
(hat, scarf, coat, gloves)
(hat, scarf, gloves)
(hat, gloves)
(scarf, coat, gloves)
What is the confidence of the rule (gloves -> hat)?
(hat, scarf, coat)
(hat, scarf, coat, gloves)
(hat, scarf, gloves)
(hat, gloves)
(scarf, coat, gloves)
What is the confidence of the rule (gloves -> hat)?
Correct Answer: A
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