Dell EMC D-DS-FN-23 Exam Practice Test Instant Access

Question 1

After which phase of the data analytics lifecycle should you determine if the model needs any recalibration?

AModel planning

BData preparation

CDiscovery

DOperationalize

Answer : D

Question 2

Which SQL OLAP grouping extension returns a result for each output row with 1 identifying a summary row and 0 identifying grouped rows?

ACUBE

BGROUPING

CGROUP ID

DROLLUP

Answer : B

Question 3

What action occurs during feature selection in the model building phase of the data analytics lifecycle?

ACreate new combinations of attributes

BOverfit the model to improve prediction accuracy

CIdentify the most useful input variables

DSelect a superset of variables to shorten training times

Answer : C

Question 4

When using association rules, what is an itemset?

ASet of continuous variables that are linked

BSet of discrete variables that are linked

CSupport

DConfidence

Answer : B

Question 5

In K-means clustering, what is a graph of the WSS versus the value of K used to help determine?

AOptimal distance between clusters

BAverage distance between observations

C'Optimal number of clusters

DAverage distance between clusters

Answer : C

Question 6

In time series analysis, what function is examined to identify the order of the autoregressive component of an ARIMA model?

ALogistic function

BLognormal distribution function

CPartial autocorrelation function

DNormal distribution function

Answer : C

Question 7

In the data preparation phase of the data analytics lifecycle, what does the term ''data conditioning'' refer to?

ABuilding training and testing datasets

BIdentifying relationships and correlations among variables

CDeploying the model and monitoring its performance

DCleaning the data, normalizing datasets. and performing transformations

Answer : D

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