D-DS-FN-23 by EMC Valid Free Exam Practice Test

Question 1

Which chart type is the most effective way to show trends over time?

A. Histogram B. Bar Chart C. Stacked Bar Chart D. Line Chart

Correct Answer: D

Question 2

In a user-defined aggregate function, what is SFUNC?

A. State transition function B. Window function C. Final calculation function D. Segment-level calculation function

Correct Answer: A

Question 3

Refer to the exhibit.

You are using K-means clustering to classify customer behavior for a large retailer. You need to determine the optimum number of customer groups. You plot the within-sum-of- squares (wss) data as shown in the exhibit.
How many customer groups should you specify?

A. 3 B. 4 C. 8 D. 2

Correct Answer: B

Question 4

What is a benefit of Spark in-memory data processing as opposed to using MapReduce?

A. Allows parallel processing, which MapReduce does not support B. Removes the need to use disks at all, which reduces cost C. Avoids writing intermediate data to disk, which speeds up processing D. Supports processing unstructured data, which MapReduce does not allow

Correct Answer: C

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Question 5

Which graphical representation shows the distribution and multiple summary statistics of a continuous variable for each value of a corresponding discrete variable?

A. dotplot B. scatterplot C. box and whisker plot D. binplot

Correct Answer: C

Question 6

What is a core deliverable at the end of the analytic project?

A. An implemented database design B. The training materials C. A presentation for project sponsors D. A whitepaper describing the project and the implementation

Correct Answer: C

Question 7

Refer to the Exhibit.

You are going into a meeting where you anticipate your manager will have a question on your dataset.
Specifically, your manager will want to know about customers that are classified as renters with a good credit status.
In order to prepare for the meeting, you create a rule: RENTER => GOOD CREDIT.
What is the confidence of this rule?

A. 73% B. 41% C. 18% D. 63%

Correct Answer: D

Question 8

Refer to the exhibit.

Which type of data issue would you suspect based on the exhibit?

A. The exhibit does not raise any obvious concerns with the data. B. "Saturated" data, indicating potential issues with data definitions C. Incomplete data, indicating potential issues with data transmission D. Mis-scaled data, indicating potential issues with data entry

Correct Answer: B

Question 9

What does the R code z <- f[1:10, ] do?

A. Assigns a sequence of values from 1 to 10 to z B. Assigns the 1st 10 columns to z C. Assigns the 1st 10 columns of the 1st row of f to z D. Assigns the first 10 rows of f to the vector z

Correct Answer: D

Question 10

Which word or phrase completes the statement? Structured data is to OLAP data as quasi- structured data is to

A. Image files B. Text documents C. XML data D. Clickstream data

Correct Answer: D

Question 11

What is the purpose of applying the naive Bayes conditional independence assumption?

A. To minimize rounding errors in probability calculations B. To simplify the probability calculations C. To calculate the probability of rare events D. To accurately calculate each probability

Correct Answer: B

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Question 12

Which data asset is an example of unstructured data?

A. News article text B. Webserver log C. XML data file D. Database table

Correct Answer: A

EMC Dell Data Science Foundations - D-DS-FN-23 Exam Practice Test