EMC E20-026 Online Practice Questions and Exam Preparation

EMC E20-026 Online Questions & Answers

• Question 41:

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

  A. Uses only structured data
  B. Supports solving "what if" scenarios
  C. Uses large data sets
  D. Uses predictive modeling techniques
  A. Uses only structured data

• Question 42:

  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
  A. Document C

• Question 43:

  You are performing a market basket analysis using the Apriori algorithm. Which measure is a ratio describing the how many more times two items are present together than would be expected if those two items are statistically independent?

  A. Lift
  B. Leverage
  C. Support
  D. Confidence
  A. Lift

• Question 44:

  Refer to the exhibit.

  You ran a linear regression, and the final output is seen in the exhibit. Based only on the information in the exhibit and an acceptable confidence level of 95%, how would you interpret the interaction of variable D with the dependent variable?

  

  A. In this model,Variable D is not significantly interacting with the dependent variable
  B. For every 1 unit increase in variable D,holding all other variables constant,we can expect the dependent variable to increase by 10.23 units
  C. For every 1 unit increase in variable D,holding all other variables constant,we can expect the dependent variable to be multiplied by 10.23 units
  D. Variable D is more significant than variables A,B,and C.
  A. In this model,Variable D is not significantly interacting with the dependent variable

• Question 45:

  In R, functions like plot() and hist() are known as what?

  A. generic functions
  B. virtual methods
  C. virtual functions
  D. generic methods
  B. virtual methods

• Question 46:

  In the MapReduce framework, what is the purpose of the Reduce function?

  A. It aggregates the results of the Map function and generates processed output
  B. It distributes the input to multiple nodes for processing
  C. It writes the output of the Map function to storage
  D. It breaks the input into smaller components and distributes to other nodes in the cluster 26 / 55
  A. It aggregates the results of the Map function and generates processed output

• Question 47:

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

• Question 48:

  Data visualization is used in the final presentation of an analytics project. For what else is this technique commonly used?

  A. Data exploration
  B. Descriptive statistics
  C. ETLT
  D. Model selection
  A. Data exploration

• Question 49:

  Which graphical representation shows the distribution and multiple summary statistics of a continuous variable for each value of a corresponding discrete variable?

  A. box and whisker plot
  B. dotplot
  C. scatterplot
  D. binplot
  A. box and whisker plot

• Question 50:

  You have two tables of customers in your database. Customers in cust_table_1 were sent an e-mail promotion last year, and customers in cust_table_2 received a newsletter last year. Customers can only be entered in once per table. You want to create a table that includes all customers, and any of the communications they received last year. Which type of join would you use for this table?

  A. Full outer join
  B. Inner join
  C. Left outer join
  D. Cross join
  A. Full outer join