EMC E20-007 Online Practice Questions and Exam Preparation

EMC E20-007 Online Questions & Answers

• Question 121:

  When would you prefer a Naive Bayes model to a logistic regression model for classification?

  A. When you are using several categorical input variables with over 1000 possible values each.
  B. When you need to estimate the probability of an outcome, not just which class it is in.
  C. When all the input variables are numerical.
  D. When some of the input variables might be correlated.
  A. When you are using several categorical input variables with over 1000 possible values each.

• Question 122:

  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
  A. MADlib

• Question 123:

  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
  A. Constant variance around a constant mean is apparent

• Question 124:

  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
  A. Sqoop

• Question 125:

  Your company has 3 different sales teams. Each team's sales manager has developed incentive offers to increase the size of each sales transaction. Any sales manager whose incentive program can be shown to increase the size of the

  average sales transaction will receive a bonus.

  Data are available for the number and average sale amount for transactions offering one of the incentives as well as transactions offering no incentive.

  The VP of Sales has asked you to determine analytically if any of the incentive programs has resulted in a demonstrable increase in the average sale amount. Which analytical technique would be appropriate in this situation?

  A. One-way ANOVA
  B. Multi-way ANOVA
  C. Student's t-test
  D. Wilcoxson Rank Sum Test
  A. One-way ANOVA

• Question 126:

  When creating a presentation for a technical audience, what is the main objective?

  A. Show that you met the project goals
  B. Show how you met the project goals
  C. Show if the model will meet the SLA
  D. Show the technique to be used in the production environment
  B. Show how you met the project goals

• Question 127:

  What is an appropriate data visualization to use in a presentation for a project sponsor?

  A. Bar chart
  B. Pie chart
  C. Box and Whisker plot
  D. Density plot
  A. Bar chart

• Question 128:

  Refer to the exhibit.

  

  The exhibit shows four graphs labeled as Fig A thorough Fig D. Which figure represents the entropy function relative to a Boolean classification and is represented by the formula shown in Exhibit?

  A. Fig-A
  B. Fig-B
  C. Fig-C
  D. Fig-D
  A. Fig-A

• Question 129:

  What describes a true limitation of a Logistic Regression method?

  A. Does not handle missing values well
  B. Does not handle redundant variables well
  C. Does not handle correlated variables well
  D. Does not have explanatory values
  A. Does not handle missing values well

• Question 130:

  Refer to the exhibit.

  

  What provides the decision tree for predicting whether or not someone is a good or bad credit risk. What would be the assigned probability, p(good), of a single male with no known savings?

  A. 0.83
  C. 0.498
  D. 0.6
  A. 0.83