EMC E20-026 Online Practice Questions and Exam Preparation

EMC E20-026 Online Questions & Answers

• Question 81:

  In addition to less data movement and the ability to use larger datasets in calculations, what is a benefit of analytical calculations in a database?

  A. quicker time to insight
  B. more efficient handling of categorical values
  C. improved connections between disparate data sources
  D. full use of data aggregation functionality
  A. quicker time to insight

• Question 82:

  You have been assigned to do a study of the daily revenue effect of a pricing model of online transactions. All the data currently available to you has been loaded into your analytics database; revenue data, pricing data, and online transaction data. You find that all the data comes in different levels of granularity. The transaction data has timestamps (day, hour, minutes, seconds), pricing is stored at the daily level, and revenue data is only reported monthly. What is your next step?

  A. Report back to the business owner that the current data model does not support the business question.
  B. Interpolate a daily model for revenue from the monthly revenue data.
  C. Aggregate all data to the monthly level in order to create a monthly revenue model.
  D. Disregard revenue as a driver in the pricing model,and create a daily model based on pricing and transactions only.
  A. Report back to the business owner that the current data model does not support the business question.

• Question 83:

  Refer to the exhibit Consider the training data set shown in the exhibit. What are the classification (Y = 0 or 1) and the probability of the classification for the tupleX(0, 0, 1) using Naive Bayesian classifier?

  

  A. Classification Y = 1,Probability = 4/54
  B. Classification Y = 0,Probability = 1/54
  C. Classification Y = 1,Probability = 1/54
  D. Classification Y = 0,Probability = 4/54
  A. Classification Y = 1,Probability = 4/54

• Question 84:

  What is a property of window functions in SQL commands?

  A. They can be used to calculate moving averages over various intervals.
  B. They group rows into a single output row.
  C. They can be used between the keywords FROM and WHERE in a SELECT command.
  D. They don't require ordering of data within a window.
  A. They can be used to calculate moving averages over various intervals.

• Question 85:

  Which ROC curve represents a perfect model fit?

  

  A. B.
  C. 52 / 55
  A. B.

• Question 86:

  In the MapReduce framework, what is the purpose of the Map Function?

  A. It processes the input and generates key-value pairs
  B. It collects the output of the Reduce function
  C. It sorts the results of the Reduce function
  D. It breaks the input into smaller components and distributes to other nodes in the cluster
  A. It processes the input and generates key-value pairs

• Question 87:

  In linear regression modeling, which action can be taken to improve the linearity of the relationship between the dependent and independent variables?

  A. Apply a transformation to a variable
  B. Use a different statistical package
  C. Calculate the R-Squared value
  D. Change the units of measurement on the independent variable
  A. Apply a transformation to a variable

• Question 88:

  In which lifecycle stage are appropriate analytical techniques determined?

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

• Question 89:

  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
  A. Communication skill

• Question 90:

  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