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EMC D-DS-FN-23 Exam Syllabus Topics:
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EMC Dell Data Science Foundations Sample Questions (Q161-Q166):
NEW QUESTION # 161
Which SQL OLAP extension provides all possible grouping combinations?
Answer: A
NEW QUESTION # 162
You have created a Logistic Regression model to predict customer churn for your company. The company's Marketing department wants to use your model to identify at-risk customers and offer incentives to keep them from leaving.
Using two different thresholds for the model provides the two confusion matrices shown in the graphic.
Marketing understands the relative costs of missing at-risk customers versus offering incentives to customers who are not at risk. Therefore, you need their advice on how to set the appropriate threshold on the churn model.
You are meeting with the Marketing team. In the meeting, you plan to state: "Raising the threshold from 0.5 to 0.75 reduces the number of unnecessary incentives that can be offered, at the cost of missing more of the customers who churned." What is the most appropriate visual to reinforce this statement?
Answer: D
NEW QUESTION # 163
Which word or phrase completes the statement? Data-ink ratio is to data visualization as _________.
Answer: B
NEW QUESTION # 164
Consider this SQL statement: SELECT product, avg(prod_cost) FROM product_detail GROUP BY product.
The GROUP BY clause implies what type of function?
Answer: C
Explanation:
The GROUP BY clause in the SQL statement implies the use of an aggregate function. In this case, avg (prod_cost) is an aggregate function that calculates the average of the product costs for each group of products.
NEW QUESTION # 165
A study was run to identify general dietary patterns among the residents of a small town. Twelve thousand people were surveyed and the data was subject to K-means clustering.
In one of the iterations, there were six clusters formed with 38, 1560, 1799, 2560, 2893, and 3150 respondents.
What should be the next step in identifying optimal clusters?
Answer: B
NEW QUESTION # 166
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