EMC EMC Certifications E20-007 Questions & Answers

• Question 171:

  Which method is used to solve for coefficients b0, b1, .., bn in your linear regression model : Y = b0 + b1x1+b2x2+....+bnxn

  A. Ordinary Least squares

  B. Apriori Algorithm

  C. Ridge and Lasso

  D. Integer programming

  Correct Answer: A

• Question 172:

  Review the following code:

  SELECT pn, vn, sum(prc*qty)

  FROM sale

  GROUP BY CUBE(pn, vn)

  ORDER BY 1, 2, 3;

  Which combination of subtotals do you expect to be returned by the query?

  A. (pn, vn)

  B. ( (pn, vn), (pn) )

  C. ( (pn, vn) , (pn), (vn) )

  D. ( (pn, vn) , (pn), (vn) , ( ) )

  Correct Answer: D

• Question 173:

  You have been assigned to do a study of the daily revenue effect of a pricing model of online transactions. You have tested all the theoretical models in the previous model planning stage, and all tests have yielded statistically insignificant results. What is your next step?

  A. Report that the results are insignificant, and reevaluate the original business question.

  B. Run all the models again against a larger sample, leveraging more historical data.

  C. Move forward on the model with the highest significance scores relative to the others.

  D. Modify samples used by the models and iterate until a significant result occurs.

  Correct Answer: A

• Question 174:

  A business colleague who is new to Hadoop approaches you with a question. The colleague wants to know the best approach to access their data. The colleague has previously worked extensively with SQL and databases.

  Which query interface should be recommended?

  A. Hive

  B. Pig

  C. Howl

  D. HBase

  Correct Answer: A

• Question 175:

  Refer to the Exhibit.

  

  In the Exhibit. For effective visualization, what is the chart's primary flaw?

  A. The use of 3 dimensions.

  B. The slanting of axis labels.

  C. The location of the legend.

  D. The order of the columns.

  Correct Answer: A

• Question 176:

  Which functionality do regular expressions provide?

  A. text pattern matching

  B. underflow prevention

  C. increased numerical precision D. decreased processing complexity

  Correct Answer: A

• Question 177:

  For which class of problem is MapReduce most suitable?

  A. Embarrassingly parallel

  B. Minimal result data

  C. Simple marginalization tasks

  D. Non-overlapping queries

  Correct Answer: A

• Question 178:

  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

  Correct Answer: A

• Question 179:

  Your colleague, who is new to Hadoop, approaches you with a question. They want to know how best to access their data. This colleague has previously worked extensively with SQL and databases.

  Which query interface would you recommend?

  A. Hive

  B. Pig

  C. Howl

  D. HBase

  Correct Answer: A

• Question 180:

  Which word or phrase completes the statement? Data-ink ratio is to data visualization as __________ .

  A. Confusion matrix is to classifier

  B. Data scientist is to big data

  C. Seasonality is to ARIMA

  D. K-means is to Naive Bayes

  Correct Answer: A