EMC E20-026 Online Practice Questions and Exam Preparation

EMC E20-026 Online Questions & Answers

• Question 31:

  A disk drive manufacturer has a defect rate of less than 1.5% with 98% confidence. A quality assurance team samples 1000 disk drives and finds 14 defective units. Which action should the team recommend?

  A. The manufacturing process is functioning properly and no further action is required
  B. A larger sample size should be taken to determine if the plant is operating correctly
  C. A smaller sample size should be taken to determine if the plant is operating correctly
  D. There is a flaw in the quality assurance process and the sample should be repeated
  A. The manufacturing process is functioning properly and no further action is required

• Question 32:

  You are using k-means clustering to classify heart patients for a hospital. You have chosen Patient Sex, Height, Weight, Age and Income as measures and have used 3 clusters. When you create a pair-wise plot of the clusters, you notice that there is significant overlap between the clusters. What should you do?

  A. Identify additional measures to add to the analysis
  B. Remove one of the measures
  C. Decrease the number of clusters
  D. Increase the number of clusters
  C. Decrease the number of clusters

• Question 33:

  You have been assigned to do a study of the daily revenue effect of a pricing model of online transactions. When have you completed the analytics lifecycle?

  A. You have written documentation,and the code has been handed off to the Data Base Administrator and business operations.
  B. You have a completely developed model,and the results have shown statistically acceptable results.
  C. You have presented the results of the model to both the internal analytics team and the business owner of the project.
  D. You have a completely developed model based on both a sample of the data and the entire set of data available.
  A. You have written documentation,and the code has been handed off to the Data Base Administrator and business operations.

• Question 34:

  Which R data structure allows elements to have different data types?

  A. List
  B. Vector
  C. Matrix
  D. Array
  A. List

• Question 35:

  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 36:

  Since R factors are categorical variables, they are most closely related to which data classification level?

  A. nominal
  B. ordinal
  C. interval
  D. ratio
  A. nominal

• Question 37:

  Which word or phrase completes the statement? A spreadsheet is to a data island as a centralized database for reporting is to a ________?

  A. Data Warehouse
  B. Data Repository
  C. Analytic Sandbox
  D. Data Mart
  A. Data Warehouse

• Question 38:

  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 39:

  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 40:

  The web analytics team uses Hadoop to process access logs. They now want to correlate this data with structured user data residing in a production single-instance JDBC database. They collaborate with the production team to import the data into Hadoop. Which tool should they use?

  A. Sqoop
  B. Pig
  C. Chukwa
  D. Scribe
  A. Sqoop