EMC E20-026 Online Practice Questions and Exam Preparation

EMC E20-026 Online Questions & Answers

• Question 21:

  In data visualization, what is used to focus the audience on a key part of a chart?

  A. Emphasis colors
  B. Detailed text
  C. Pastel colors
  D. A data table
  A. Emphasis colors

• Question 22:

  How are window functions different from regular aggregate functions?

  A. Rows retain their separate identities and the window function can access more than the current row.
  B. Rows are grouped into an output row and the window function can access more than the current row.
  C. Rows retain their separate identities and the window function can only access the current row.
  D. Rows are grouped into an output row and the window function can only access the current row.
  A. Rows retain their separate identities and the window function can access more than the current row.

• Question 23:

  In which lifecycle stage are test and training data sets created?

  A. Model building
  B. Model planning
  C. Discovery
  D. Data preparation
  A. Model building

• Question 24:

  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

• Question 25:

  A call center for a large electronics company handles an average of 35, 000 support calls a day. The head of the call center would like to optimize the staffing of the call center during the rollout of a new product due to recent customer

  complaints of long wait times. You have been asked to create a model to optimize call center costs and customer wait times.

  The goals for this project include:

  1.

  Relative to the release of a product, how does the call volume change over time?

  2.

  How to best optimize staffing based on the call volume for the newly released product, relative to old products.

  3.

  Historically, what time of day does the call center need to be most heavily staffed?

  4.

  Determine the frequency of calls by both product type and customer language. Which goals are suitable to be completed with MapReduce?

  A. Goal 2 and 4
  B. Goal 1 and 3
  C. Goals 1,2,3,4
  D. Goals 2,3,4
  A. Goal 2 and 4

• Question 26:

  Which word or phrase completes the statement? Emphasis color is to standard color as _______ .

  A. Main message is to context
  B. Main message is to key findings
  C. Frequent item set is to item
  D. Pie chart is to proportions
  A. Main message is to context

• Question 27:

  You are building a logistic regression model to predict whether a tax filer will be audited within the next two years. Your training set population is 1000 filers. The audit rate in your training data is 4.2%. What is the sum of the probabilities that the model assigns to all the filers in your training set that have been audited?

  A. 42.0
  B. 4.2
  C. 0.42
  D. 0.042
  A. 42.0

• Question 28:

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

• Question 29:

  In which phase of the analytic lifecycle would you expect to spend most of the project time?

  A. Discovery
  B. Data preparation
  C. Communicate Results
  D. Operationalize
  C. Communicate Results

• Question 30:

  For which class of problem is MapReduce most suitable?

  A. Embarrassingly parallel
  B. Minimal result data
  C. Simple marginalization tasks
  D. Non-overlapping queries
  A. Embarrassingly parallel