EMC EMC Specialist E20-026 Questions & Answers

• Question 51:

  Imagine you are trying to hire a Data Scientist for your team. In addition to technical ability and quantitative background, which additional essential trait would you look for in people applying for this position?

  A. Communication skill

  B. Scientific background

  C. Domain expertise

  D. Well Organized

  Correct Answer: A

• Question 52:

  What describes the use of UNION clause in a SQL statement?

  A. Operates on queries and potentially increases the number of rows

  B. Operates on queries and potentially decreases the number of rows

  C. Operates on tables and potentially decreases the number of columns

  D. Operates on both tables and queries and potentially increases both the number of rows and columns

  Correct Answer: A

• Question 53:

  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 54:

  What is a core deliverable at the end of the analytic project?

  A. An implemented database design

  B. A whitepaper describing the project and the implementation

  C. A presentation for project sponsors

  D. The training materials

  Correct Answer: C

• Question 55:

  You have been assigned to run a logistic regression model for each of 100 countries, and all the data is currently stored in a PostgreSQL database. Which tool/library would you use to produce these models with the least effort?

  A. MADlib

  B. Mahout

  C. RStudio

  D. HBase

  Correct Answer: A

• Question 56:

  You submit a MapReduce job to a Hadoop cluster and notice that although the job was successfully submitted, it is not completing. What should you do?

  A. Ensure that the TaskTracker is running.

  B. Ensure that the JobTracker is running

  C. Ensure that the NameNode is running

  D. Ensure that a DataNode is running

  Correct Answer: A

• Question 57:

  A disk drive manufacturer has a defect rate of less than 1.5% with 98% confidence. A quality assurance team samples 1000 disk drives and finds 14 defective units. Which action should the team recommend?

  A. The manufacturing process is functioning properly and no further action is required

  B. A larger sample size should be taken to determine if the plant is operating correctly

  C. A smaller sample size should be taken to determine if the plant is operating correctly

  D. There is a flaw in the quality assurance process and the sample should be repeated

  Correct Answer: A

• Question 58:

  A. Mahout

  B. HBase

  C. Scribe

  D. Sqoop

  Correct Answer: A

• Question 59:

  Which method is used to solve for coefficients b0, b1, .., bn in your linear regression model : Y = b0 + b1x1+b2x2+....+bnxn

  A. Ordinary Least squares

  B. Apriori Algorithm

  C. Ridge and Lasso

  D. Integer programming

  Correct Answer: D

• Question 60:

  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