EMC EMC Certifications E20-065 Questions & Answers

• Question 41:

  What are two visualization tools used for trivariate data?

  A. Scatter plot matrix

  B. Hexbin plot and heatmap

  C. Scatter plot matrix and density plot

  D. Scatter plot matrix and heatmap

  Correct Answer: B

• Question 42:

  You are analyzing written transcripts of focus groups conducted on product X. You approach is to use TFIDF for your analysis.

  What combination of TF-IDF scores should you examine to ensure you only report on the most important terms?

  A. High TF score and high DF score

  B. High TF score and high IDF score

  C. High TF score and low IDF score

  D. Low TF score and low DF score

  Correct Answer: C

• Question 43:

  What is an important simu-lation design consideration?

  A. Ensure model Inputs align with reality

  B. Use different seed values to regenerate results

  C. For rare event models, minimize number of trials

  D. A complex model is better than a simple model

  Correct Answer: A

• Question 44:

  In a social network, what does it mean for a node to have a high degree but low betweenness?

  A. The node is adjacent to a few nodes, each of each has high Page Ranks.

  B. The node has the only edge connecting its community to the rest of the graph.

  C. The node can be easily bypassed by communications taking other shorter paths.

  D. The node acts as the hub of the graph.

  Correct Answer: D

• Question 45:

  A hotel chain runs a simul-ation on room pricing. They want to estimate revenue, per hotel, within +/- $10 with 95% confidence (Za/2=1.96). The estimated revenue standard deviation is $5000 based on previous booking data.

  What is the optimal number of simulation trials to run?

  A. A 32-bit operating system was used

  B. The same number of trials was used

  C. A linear congruential generator (LCG) was used (or pseudo-random number generation

  D. Different seeds tor the random number generator were used.

  Correct Answer: C

• Question 46:

  Which library is NOT part of the Apache Spark distribution?

  A. MLib

  B. NLTK

  C. GraphX

  D. Spark SQL

  Correct Answer: B

• Question 47:

  In which step in the visualization lifecycle would you determine how the raw data is stored?

  A. Visualization Planning

  B. Data Preparation

  C. Visualization Building

  D. Discovery

  Correct Answer: B

• Question 48:

  What runs more efficiently because of Apache Tez?

  A. Pig and Hive

  B. Hive and HBase

  C. Yarn and Spark

  D. All MapReduce jobs

  Correct Answer: D

• Question 49:

  What advantage does replication provide while storing a file in HDFS?

  A. Data protection and scheduling flexibility

  B. Elimination of requirement for a combiner process

  C. Elimination of requirement for Shuffle and Sort process

  D. Memory optimization and minimizing tasks to run

  Correct Answer: A

• Question 50:

  What is an ideal use case for HDFS?

  A. Storing files that are updated frequently

  B. Storing files that are written once and read many times

  C. Storing results between Map steps and Reduce steps

  D. Storing application files in memory

  Correct Answer: B