Associate - Data Science and Big Data Analytics v2 Exam (DEA-7TT2) Free Practice Test

Question 1

Refer to the exhibit.

The exhibit shows four graphs labeled as Fig A thorough Fig D. Which figure represents the entropy function relative to a Boolean classification and is represented by the formula shown in Exhibit?
Response:

A. Fig-D

B. Fig-A

C. Fig-B

D. Fig-C

Correct Answer: B

Question 2

You are provided with the following list. Which window function is missing?
cume_dist()
dense_rank()
rank()
percent_rank()
first_value()
last_value()
lag()
lead()
ntile()
Response:

A. median()

B. cumulative_sum()

C. row_number()

D. row_preceding()

Correct Answer: C

Question 3

Which component of a final presentation focuses on how to deploy the model?
Response:

A. Recommendations

B. Approach

C. Executive summary

D. Project goals

Correct Answer: A

Question 4

What describes a true limitation of a Logistic Regression method?
Response:

A. Does not handle correlated variables well

B. Does not handle redundant variables well

C. Does not have explanatory values

D. Does not handle missing values well

Correct Answer: D

Question 5

What is a property of window functions in SQL commands?
Response:

A. They don,t require ordering of data within a window.

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 can be used to calculate moving averages over various intervals.

Correct Answer: D

Question 6

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

A. Pig,s schema requires that the data is physically present when the schema is defined

B. Pig,s schema is required for ETL

C. Pig,s schema is optional

D. Pig,s schema supports a single data type

Correct Answer: C

Question 7

What does R code nv <- v[v < 1000] do?
Response:

A. Sets nv to TRUE or FALSE depending on whether all elements of vector v are less than 1000

B. Selects values of vector v less than 1000, modifies v, and makes a copy to nv

C. Removes elements of vector v less than 1000 and assigns the elements >= 1000 to nv

D. Selects the values in vector v that are less than 1000 and assigns them to the vector nv

Correct Answer: D

Question 8

Which activity is performed in the Operationalize phase of the Data Analytics Lifecycle?
Response:

A. Define the process to maintain the model

B. Try different analytical techniques

C. Transform existing variables

D. Try different variables

Correct Answer: B

Question 9

Under which circumstance do you need to implement N-fold cross-validation after creating a regression model?
Response:

A. There is not enough data to create a test set.

B. There are missing values in the data.

C. There are categorical variables in the model.

D. The data is unformatted.

Correct Answer: A

Question 10

When is a Wilcoxon Rank-Sum test used?
Response:

A. When an assumption about the distribution of the populations cannot be made

B. When the data cannot be easily sorted

C. When the data can be easily sorted

D. When the populations represent the sums of other values

Correct Answer: A

Question 11

The web analytics team uses Hadoop to process access logs. They now want to correlate this data with structured user data residing in their massively parallel database. Which tool should they use to export the structured data from Hadoop?
Response:

A. Sqoop

B. Pig

C. Chukwa

D. Scribe

Correct Answer: A

Question 12

A fair six-sided die is rolled. Let A denote the event that an odd number is rolled. Let C denote the event that a 1, 2, or 3 is rolled. What is the value of the conditional probability, P(C|A)?
Response:

A. 1/4

B. 2/3

C. 1/3

D. 1/2

Correct Answer: B

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EMC Associate - Data Science and Big Data Analytics v2 (DEA-7TT2) Free Practice Test