EMC EMC Certifications E20-007 Questions & Answers

• Question 71:

  Based on the exhibit, the table shows the values for the input Boolean attributes A, B, and

  C. In addition, the exhibit shows the values for the output attribute "class".

  

  Which decision tree is valid for the data?

  A. Tree A

  B. Tree B

  C. Tree C

  D. Tree D

  Correct Answer: B

• Question 72:

  In data visualization, which type of chart is recommended to represent frequency data?

  A. Line chart

  B. Histogram

  C. Q-Q chart

  D. Scatterplot

  Correct Answer: B

• Question 73:

  You are asked to create a model to predict the total number of monthly subscribers for a specific magazine. You are provided with 1 year's worth of subscription and payment data, user demographic data, and 10 years worth of content of the magazine (articles and pictures). Which algorithm is the most appropriate for building a predictive model for subscribers?

  A. Linear regression

  B. Logistic regression

  C. Decision trees

  D. TF-IDF

  Correct Answer: A

• Question 74:

  You have fit a decision tree classifier using 12 input variables. The resulting tree used 7 of the 12 variables, and is 5 levels deep. Some of the nodes contain only 3 data points. The AUC of the model is

  0.85. What is your evaluation of this model?

  A. The tree is probably overfit. Try fitting shallower trees and using an ensemble method.

  B. The AUC is high, and the small nodes are all very pure. This is an accurate model.

  C. The tree did not split on all the input variables. You need a larger data set to get a more accurate model.

  D. The AUC is high, so the overall model is accurate. It is not well-calibrated, because the small nodes will give poor estimates of probability.

  Correct Answer: A

• Question 75:

  Refer to the exhibit.

  

  Click on the calculator icon in the upper left corner. You are going into a meeting where you know your manager will have a question on your dataset -- specifically relating to customers that are classified as renters with good credit status.

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

  A. 63%

  B. 41%

  C. 18%

  D. 73%

  Correct Answer: A

• Question 76:

  What is the purpose of the process step "parsing" in text analysis?

  A. imposes a structure on the unstructured/semi-structured text for downstream analysis

  B. performs the search and/or retrieval in finding a specific topic or an entity in a document

  C. executes the clustering and classification to organize the contents

  D. computes the TF-IDF values for all keywords and indices

  Correct Answer: A

• Question 77:

  You have run the association rules algorithm on your data set, and the two rules {banana, apple} => {grape} and {apple, orange}=> {grape} have been found to be relevant. What else must be true?

  A. {grape, apple, orange} must be a frequent itemset.

  B. {banana, apple, grape, orange} must be a frequent itemset.

  C. {grape} => {banana, apple} must be a relevant rule.

  D. {banana, apple} => {orange} must be a relevant rule.

  Correct Answer: A

• Question 78:

  Which characteristic applies mainly to Data Science as opposed to Business Intelligence?

  A. Advanced analytical methods

  B. Robust reporting

  C. Focus on structured data

  D. Data dashboards

  Correct Answer: A

• Question 79:

  The web analytics team uses Hadoop to process access logs. They now want to correlate this data with structured user data residing in their massively parallel database. Which tool should they use to export the structured data from Hadoop?

  A. Sqoop

  B. Pig

  C. Chukwa

  D. Scribe

  Correct Answer: A

• Question 80:

  What is one modeling or descriptive statistical function in MADlib that is typically not provided in a standard relational database?

  A. Linear regression

  B. Expected value

  C. Variance

  D. Quantiles

  Correct Answer: A