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EMC Dell Data Science Foundations Sample Questions (Q291-Q296):

NEW QUESTION # 291
Review the following code:
SELECT pn, vn, sum(prc*qty) FROM sale
GROUP BY CUBE(pn, vn) ORDER BY 1, 2, 3;
Which combination of subtotals do you expect to be returned by the query?

A. ( (pn, vn) , (pn), (vn) )
B. (pn, vn)
C. ( (pn, vn) , (pn), (vn) , ( ) )
D. ( (pn, vn), (pn) )

Answer: C

NEW QUESTION # 292
You have been assigned to run a linear regression model for each of 5, 000 distinct districts, and all the data is currently stored in a PostgreSQL database.
Which tool/library would you use to produce these models with the least effort?

A. HBase
B. R
C. MADlib
D. Mahout

Answer: C

NEW QUESTION # 293
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?

A. Association Rules
B. K Means Clustering
C. Logistic Regression
D. Naive Bayesian

Answer: B

NEW QUESTION # 294
The graph represents the plot of WSS as a function of K for a K-means clustering analysis you performed.

Which point in the graph represents the most optimal value of K?

A. C
B. A
C. B
D. D

Answer: A

NEW QUESTION # 295
When is a Wilcoxon Rank-Sum test used?

A. When the populations represent the sums of other values
B. When the data can be easily sorted
C. When an assumption about the distribution of the populations cannot be made
D. When the data cannot be easily sorted

Answer: C

NEW QUESTION # 296
......

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