EMC EMC Certifications E20-007 Questions & Answers

• Question 131:

  Which key role for a successful analytic project can provide business domain expertise with a deep understanding of the data and key performance indicators?

  A. Business Intelligence Analyst

  B. Project Manager

  C. Project Sponsor

  D. Business User

  Correct Answer: A

• Question 132:

  You have been assigned to do a study of the daily revenue effect of a pricing model of online transactions. When have you completed the analytics lifecycle?

  A. You have written documentation, and the code has been handed off to the Data Base Administrator and business operations.

  B. You have a completely developed model, and the results have shown statistically acceptable results.

  C. You have presented the results of the model to both the internal analytics team and the business owner of the project.

  D. You have a completely developed model based on both a sample of the data and the entire set of data available.

  Correct Answer: A

• Question 133:

  Before building an ARMA model, how can you determine if the time series is weakly stationary?

  A. Constant variance around a constant mean is apparent

  B. Mean of the series is close to 0

  C. Series is normally distributed

  D. No trend component is apparent

  Correct Answer: A

• Question 134:

  Which chart type is the most effective way to show trends over time?

  A. Line Chart

  B. Bar Chart

  C. Stacked Bar Chart

  D. Histogram

  Correct Answer: A

• Question 135:

  What does R code nv <- v[v < 1000] do?

  A. Selects the values in vector v that are less than 1000 and assigns them to the vector nv

  B. Sets nv to TRUE or FALSE depending on whether all elements of vector v are less than

  C. Removes elements of vector v less than 1000 and assigns the elements >= 1000 to nv

  D. Selects values of vector v less than 1000, modifies v, and makes a copy to nv

  Correct Answer: A

• Question 136:

  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 C

  B. Document A

  C. Document B

  D. Document D

  Correct Answer: A

• Question 137:

  Refer to the exhibit.

  

  In the exhibit, a correlogram is provided based on an autocorrelation analysis of a sample dataset. What can you conclude based only on this exhibit?

  A. There appears to be no structure left to model in the data

  B. There appears to be a seasonal component in the data

  C. Lag 1 has a significant autocorrelation

  D. There appears to be a cyclical component in the data

  Correct Answer: A

• Question 138:

  You have been assigned to run a Logistic Regression model for 100 countries each. All data is currently stored in a PostgreSQL database.

  Which tool/library should be used to produce these models with the least effort?

  A. MADlib

  B. Mahout

  C. RStudio

  D. HBase

  Correct Answer: A

• Question 139:

  Refer to the exhibit.

  

  You are using K-means clustering to classify customer behavior for a large retailer. You need to determine the optimum number of customer groups. You plot the within-sum-of- squares (wss) data as shown in the exhibit. How many customer groups should you specify?

  A. 2

  B. 3

  C. 4

  D. 8

  Correct Answer: C

• Question 140:

  A data scientist wants to predict the probability of death from heart disease based on three risk factors: age, gender, and blood cholesterol level.

  What is the most appropriate method for this project?

  A. Logistic regression

  B. Linear regression

  C. K-means clustering

  D. Apriori algorithm

  Correct Answer: A