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Guide for Dell Data Science Foundations Exam

Quiz Dell Data Science Foundations Exam

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/ 10

Quiz

1/10
What is a key consideration when preparing a presentation intended for analysts?
Select the answer
1 correct answer
A.
Describe how to implement the model
B.
Provide talking points to promote or evangelize the project
C.
Emphasize the business benefits of implementing the model
D.
Focus on clean simple-to-understand visuals

Quiz

2/10
A logistic regression model is built to determine the probability of a credit card borrower defaulting
on a credit loan. A threshold value of 0.3 is selected. Which statement can be used to predict a
borrower will default?
Select the answer
1 correct answer
A.
If probability > 0.1, then predict the borrower will default
B.
If probability < 0.1, then predict the borrower will default
C.
If probability > 0.3, then predict the borrower will default
D.
If probability < 0.3, then predict the borrower will default

Quiz

3/10
What are the two data categories that represent qualitative data?
Select the answer
1 correct answer
A.
Ordinal and interval
B.
Nominal and ordinal
C.
Ratio and interval
D.
Nominal and ratio

Quiz

4/10
In hypothesis testing, when does a Type I error occur?
Select the answer
1 correct answer
A.
Null hypothesis is rejected when it is actually false
B.
Null hypothesis is rejected when it is actually true
C.
Null hypothesis is accepted when it is actually false
D.
Null hypothesis is accepted when it is actually true

Quiz

5/10
You have been given a task to improve sales force compensation of your organization. As a result of a
study, your team decides to classify personnel as follows:
● Did not meet quota
● Met quota
● Exceeded 150% of quota
In which data analytics lifecycle phase should you define these categories for analysis purposes?
Select the answer
1 correct answer
A.
Model building
B.
Communicate results
C.
Operationalize
D.
Model planning

Quiz

6/10
A decision tree is being built. An internal node is being evaluated for partitioning on variables A and
B. The entropy of the internal node is 0.8. The entropy for each of the variables is as follows:
● Variable A: 0.5
● Variable B: 0.4
Which variable will be used to partition the data and what is the information gain?
Select the answer
1 correct answer
A.
Variable B; information gain is 0.1
B.
The entropy of the internal node is 0.8. The entropy for each of the variables is as follows: ● Variable A: 0.5 ● Variable B: 0.4 Which variable will be used to partition the data and what is the information gain? A. Variable B; information gain is 0.1
C.
Variable A; information gain is 0.1
D.
Variable A; information gain is 0.5

Quiz

7/10
In association rules, given items X and Y, what does lift measure?
Select the answer
1 correct answer
A.
Percentage of transactions that contain an itemset with X
B.
Percentage of transactions with Xthat also contain Y
C.
Difference in the probability ofX and Y appearing together compared with expectations as if they were statistically independent
D.
How many times more often X and Y occur together than expected if they were statistically independent, expressed as a ratio

Quiz

8/10
What are categorized as cluster and workflow management tools for Hadoop?
Select the answer
1 correct answer
A.
Flume, Sqoop, and Storm
B.
Drill, Hive, and HBase
C.
Spark, Tez, and Cassandra
D.
Ambari, Oozie, and Zookeeper

Quiz

9/10
Consider the following text:
“Stop!” he shouted. “Don’t go there!”
What set of words result from using a tokenizer for punctuation on the text?
Select the answer
1 correct answer
A.
Stop, he, shouted, don. t. go. there
B.
Stop, he shouted, don. t go there
C.
Stop, he shouted, dpnt go there
D.
Stop, he, shouted, dpnt. go. there

Quiz

10/10
Which phase of the data analytic lifecycle includes conducting project sponsor interviews and
drafting a problem statement?
Select the answer
1 correct answer
A.
Operationalize
B.
Model planning
C.
Model building
D.
Discovery
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