DEA-7TT2 by EMC Valid Free Exam Practice Test

Question 1

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?
Response:

A. Modify samples used by the models and iterate until a significant result occurs. B. Move forward on the model with the highest significance scores relative to the others. C. Run all the models again against a larger sample, leveraging more historical data. D. Report that the results are insignificant, and reevaluate the original business question.

Correct Answer: D

Question 2

Which analytic technique would be appropriate to estimate blood pressure based on age and weight?
Response:

A. Naive Bayesian classification B. K-means clustering C. Linear regression D. Time series analysis

Correct Answer: C

Question 3

You received 100,000 home loan records and want to quickly determine if there is any correlation between mortgage age and mortgage amount before conducting advanced analysis.
Which tool should be used for the preliminary analysis?
Response:

A. Stacked Bar chart B. Histogram C. Scatter plot D. Box and Whisker plot

Correct Answer: C

Question 4

You fit a Logistic Regression model to your training data and notice that the variable X has an infinite magnitude coefficient. What does this indicate?
Response:

A. X is more correlated with the outcome than any of the other variables B. X is strongly correlated with the outcome for a subset of the data C. X is completely uncorrelated with the outcome D. X takes on only one value for most of the training data

Correct Answer: B

Question 5

What is the output format from the Map function of MapReduce?
Response:

A. Compressed index B. Unique key record and separate records of all possible values C. Key-value pairs D. Binary representation of keys concatenated with structured data

Correct Answer: C

Question 6

When would you prefer a Naive Bayes model to a logistic regression model for classification?
Response:

A. When you need to estimate the probability of an outcome, not just which class it is in. B. When you are using several categorical input variables with over 1000 possible values each. C. When all the input variables are numerical. D. When some of the input variables might be correlated.

Correct Answer: B

Question 7

Which data type value is used for the observed response variable in a logistic regression model?
Response:

A. Any real number B. A binary value C. Any integer D. Any positive real number

Correct Answer: B

Question 8

Consider this SQL statement:
SELECT product, prod_cost, avg(prod_cost) OVER (PARTITION BY product)
FROM product_detail
The OVER clause makes this what type of function?
Response:

A. User-defined function B. Aggregate function C. Window function D. System function

Correct Answer: C

Question 9

How does Pig's use of a schema differ from that of a traditional RDBMS?
Response:

A. Pig,s schema is optional B. Pig,s schema requires that the data is physically present when the schema is defined C. Pig,s schema is required for ETL D. Pig,s schema supports a single data type

Correct Answer: A

EMC Associate - Data Science and Big Data Analytics v2 - DEA-7TT2 Exam Practice Test