EMC E20-007 Online Practice Questions and Exam Preparation

EMC E20-007 Online Questions & Answers

• Question 21:

  Refer to the exhibit.

  

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

  A. There is significant autocorrelation through lag 3
  B. There is no structure left to model in the data
  C. Lag 7 has a significant negative autocorrelation
  D. Differencing is required before proceeding with any analysis
  A. There is significant autocorrelation through lag 3

• Question 22:

  Which word or phrase completes the statement?

  Theater actor is to "Artistic and Expressive" as Data Scientist is to ________________

  A. "Communicative and Collaborative"
  B. "Introverted and Technical"
  C. "Logical and Steadfast"
  D. "Independent and Intelligent"
  A. "Communicative and Collaborative"

• Question 23:

  In a Student's t-test, what is the meaning of the p-value?

  A. Area under the appropriate tails of the student's distribution
  B. Power of the Student's t-test
  C. Mean of the distribution for the null hypothesis
  D. Mean of the distribution for the alternate hypothesis
  A. Area under the appropriate tails of the student's distribution

• Question 24:

  If your intention is to show trends over time, which chart type is the most appropriate way to depict the data?

  A. Line chart
  B. Bar chart
  C. Stacked bar chart
  D. Histogram
  A. Line chart

• Question 25:

  The Marketing department of your company wishes to track opinion on a new product that was recently introduced. Marketing would like to know how many positive and negative reviews are appearing over a given period and potentially

  retrieve each review for more in- depth insight.

  They have identified several popular product review blogs that historically have published thousands of user reviews of your company's products.

  You have been asked to provide the desired analysis. You examine the RSS feeds for each blog and determine which fields are relevant. You then craft a regular expression to match your new product's name and extract the relevant text from each matching review.

  What is the next step you should take?

  A. Convert the extracted text into a suitable document representation and index into a review corpus
  B. Use the extracted text and your regular expression to perform a sentiment analysis based on mentions of the new product
  C. Read the extracted text for each review and manually tabulate the results
  D. Group the reviews using Na飗e Bayesian classification
  A. Convert the extracted text into a suitable document representation and index into a review corpus

• Question 26:

  Refer to the exhibit.

  

  You are building a decision tree. In this exhibit, four variables are listed with their respective values of info-gain. Based on this information, on which attribute would you expect the next split to be in the decision tree?

  A. Credit Score
  B. Age
  C. Income
  D. Gender
  A. Credit Score

• Question 27:

  Refer to the exhibit.

  

  Click on the calculator icon in the upper left corner. You are going into a meeting where you know your manager will have a question on your dataset -- specifically relating to customers that are classified as renters with good credit status.

  In order to prepare for the meeting, you create a rule: RENTER => GOOD CREDIT. What is the confidence of the rule?

  A. 63%
  B. 41%
  C. 18%
  D. 73%
  A. 63%

• Question 28:

  Consider these itemsets:

  (hat, scarf, coat)

  (hat, scarf, coat, gloves)

  (hat, scarf, gloves)

  (hat, gloves)

  (scarf, coat, gloves)

  What is the confidence of the rule (gloves -> hat)?

  A. 75%
  B. 60%
  C. 66%
  D. 80%
  A. 75%

• Question 29:

  Refer to the Exhibit.

  

  In the Exhibit, the table shows the values for the input Boolean attributes "A", "B", and "C". It also shows the values for the output attribute "class". Which decision tree is valid for the data?

  A. Tree B
  B. Tree A
  C. Tree C
  D. Tree D
  A. Tree B

• Question 30:

  Which word or phrase completes the statement; "A theater actor is to `artistic and expressive' as a data scientist is to ____________."?

  A. Communicative and collaborative
  B. Introverted and technical
  C. Logical and steadfast
  D. Independent and intelligent
  A. Communicative and collaborative