EMC EMC Certifications E20-007 Questions & Answers

• Question 21:

  In MADlib what does MAD stand for?

  A. Magnetic, Agile, Deep

  B. Machine Learning, Algorithms for Databases

  C. Mathematical Algorithms for Databases

  D. Modular, Accurate, Dependable

  Correct Answer: A

• Question 22:

  How does Pig's use of a schema differ from that of a traditional RDBMS?

  A. Pig's schema is optional

  B. Pig's schema requires that the data is physically present when the schema is defined

  C. Pig's schema is required for ETL

  D. Pig's schema supports a single data type

  Correct Answer: A

• Question 23:

  Refer to the exhibit.

  

  Click on the calculator icon in the upper left corner. An analyst is searching a corpus of documents for the topic "solid state disk". In the Exhibit, Table A provides the inverse document frequency for each term across the corpus. Table B provides each term's frequency in four documents selected from corpus. Which of the four documents is most relevant to the analyst's search?

  A. Document B

  B. Document A

  C. Document C

  D. Document D

  Correct Answer: A

• Question 24:

  You have scored your Na飗e Bayesian Classifier model on "hold out" test data for cross validation. You have determined the way the samples scored and have tabulated them as shown in the exhibit.

  

  What are the Precision and Recall rates of the model?

  A. Precision = 262/277 Recall = 262/288

  B. Precision =262/288 Recall = 262/277

  C. Precision = 277/262 Recall = 288/262

  D. Precision = 288/262 Recall = 277/262

  Correct Answer: A

• Question 25:

  You have used k-means clustering to classify behavior of 100, 000 customers for a retail store. You decide to use household income, age, gender and yearly purchase amount as measures. You have chosen to use 8 clusters and notice that 2 clusters only have 3 customers assigned. What should you do?

  A. Decrease the number of clusters

  B. Increase the number of clusters

  C. Decrease the number of measures used

  D. Identify additional measures to add to the analysis

  Correct Answer: A

• Question 26:

  Refer to the exhibit.

  

  The graph represents an ROC space with four classifiers labelled A through D. Which point in the graph represents a perfect classification?

  A. S

  B. P

  C. Q

  D. R

  Correct Answer: A

• Question 27:

  Your organization has a website where visitors randomly receive one of two coupons. It is also possible that visitors to the website will not receive a coupon. You have been asked to determine if offering a coupon to visitors to your website has any impact on their purchase decision.

  Which analysis method should you use?

  A. K-means clustering

  B. Association rules

  C. Student T-test

  D. One-way ANOVA

  Correct Answer: D

• Question 28:

  Which word or phrase completes the statement?

  Business Intelligence is to ad-hoc reporting and dashboards as Data Science is to ______________ .

  A. Optimization and Predictive Modeling

  B. Alerts and Queries

  C. Structured Data and Data Sources

  D. Sales and profit reporting

  Correct Answer: A

• Question 29:

  What describes a true limitation of Logistic Regression method?

  A. It does not handle missing values well.

  B. It does not handle redundant variables well.

  C. It does not handle correlated variables well.

  D. It does not have explanatory values.

  Correct Answer: A

• Question 30:

  Which of the following is an example of quasi-structured data?

  A. OLAP

  B. OLTP

  C. Customer record table

  D. Clickstream data

  Correct Answer: D