EMC EMC Certifications E20-007 Questions & Answers

• Question 81:

  Which analytical method is considered unsupervised?

  A. K-means clustering

  B. Na飗e Bayesian classifier

  C. Decision tree

  D. Linear regression

  Correct Answer: A

• Question 82:

  Refer to the Exhibit.

  

  You are going into a meeting where you anticipate your manager will have a question on your dataset. Specifically, your manager will want to know about customers that are classified as renters with a good credit status.

  In order to prepare for the meeting, you create a rule: RENTER => GOOD CREDIT. What is the confidence of this rule?

  A. 18%

  B. 41%

  C. 63%

  D. 73%

  Correct Answer: C

• Question 83:

  Which ROC curve represents a perfect model fit?

  A.

  B.

  

  C.

  D.

  

  A. Exhibit A

  B. Exhibit B

  C. Exhibit C

  D. Exhibit D

  Correct Answer: A

• Question 84:

  A data scientist plans to classify the sentiment polarity of 10, 000 product reviews collected from the Internet. What is the most appropriate model to use? Suppose labeled training data is available.

  A. Na飗e Bayesian classifier

  B. Linear regression

  C. Logistic regression

  D. K-means clustering

  Correct Answer: A

• Question 85:

  You are using MADlib for Linear Regression analysis. Which value does the statement return? SELECT (linregr(depvar, indepvar)).r2 FROM zeta1;

  A. Goodness of fit

  B. Coefficients

  C. Standard error

  D. P-value

  Correct Answer: A

• Question 86:

  When creating a project sponsor presentation, what is the main objective?

  A. Show that you met the project goals

  B. Show how you met the project goals

  C. Show how well the model will meet the SLA (service level agreement)

  D. Clearly describe the methods and techniques used

  Correct Answer: A

• Question 87:

  Refer to the exhibit.

  

  Which type of data issue would you suspect based on the exhibit?

  A. "Saturated" data, indicating potential issues with data definitions

  B. Incomplete data, indicating potential issues with data transmission

  C. Mis-scaled data, indicating potential issues with data entry

  D. The exhibit does not raise any obvious concerns with the data.

  Correct Answer: A

• Question 88:

  You are having a discussion with a business colleague. The colleague mentions that they want to perform K-means clustering on text file data stored in HDFS.

  Which tool should be recommended?

  A. Mahout

  B. HBase

  C. Scribe

  D. Sqoop

  Correct Answer: A

• Question 89:

  Which activity is performed in the Operationalize phase of the Data Analytics Lifecycle?

  A. Define the process to maintain the model

  B. Try different analytical techniques

  C. Try different variables

  D. Transform existing variables

  Correct Answer: A

• Question 90:

  If R factors are categorical variables, which data classification level are they most closely related?

  A. Nominal

  B. Ordinal

  C. Interval

  D. Ratio

  Correct Answer: A