EMC EMC Certifications E20-065 Questions & Answers

• Question 51:

  A marketing team creates a graph using a square for each data point, where the length of each side is set to the data value. The data values are 10 and 20.

  What is the lie factor of the graph?

  A. 1

  B. 2

  C. 3

  D. 6

  Correct Answer: B

• Question 52:

  How does Latent Dinchlet Allocation (LDA) interpret a document?

  A. As a single-predefined topic

  B. As a mixture of pre-defined topics

  C. As having a mixture of sentiments

  D. As having a single pre-defined sentiment

  Correct Answer: B

• Question 53:

  What is a key beneficial characteristic of the Random Forest algorithm?

  A. Provides and explanatory model

  B. Distinguishes categorical from continuous variables

  C. Support for unstructured data

  D. Resiliency to complex, non-linear variable interactions

  Correct Answer: D

• Question 54:

  Why would a company decide to use HBase to replace an existing relational database?

  A. It is required for performing ad-hoc queries.

  B. Varying formats of input data requires columns to be added in real time.

  C. The company's employees are already fluent in SQL.

  D. Existing SQL code will run unchanged on HBase.

  Correct Answer: A

• Question 55:

  Which metric would be most helpful in identifying a node that may cause network disruption if the node were removed?

  A. Degree

  B. Closeness

  C. Betweenness

  D. PageRank

  Correct Answer: A

• Question 56:

  Which graph structure would best model the relationship between job seekers and employers?

  A. Bipartite

  B. Weighted

  C. Directed acyclic

  D. Ranked

  Correct Answer: A

• Question 57:

  What is the most likely reason for an HBase table to contain millions of columns?

  A. Data is imported from a relational database table

  B. Data is stored in the column qualifier

  C. There are thousands of columns families

  D. The column names are randomly generated

  Correct Answer: B

• Question 58:

  Which scenario would be ideal for processing Hadoop data with Hive?

  A. Structured data, real-time processing

  B. Unstructured data; batch processing

  C. Unstructured data; real-time processing

  D. Structured data; batch processing

  Correct Answer: B

• Question 59:

  The naive Bayer classifier is trained over 1600 movie reviews and then tested over 400 reviews.

  Here is the resulting confusion matrix:

  190 (TP) 10(FN)

  80 (FP) 120(TN)

  What are the precision, recall, and the F1-score values?

  A. Precision0.95; Recall: 0704; F1-score: 0.809

  B. Precision 0.613, Recall: 0.95, F1-score: 0.745

  C. Precision 0.704, Recall: 0.95; F1-score: 0.809

  D. Precision 0.95; Recall: 0.613; F1-score: 0.745

  Correct Answer: C

• Question 60:

  What is a characteristic of stop words?

  A. Used in term frequency analysis

  B. Include words such as "a", "an", and "the"

  C. Meaningful words requiring a parser to stop and examine them

  D. Don't occur often in text

  Correct Answer: B