Dell EMC Data Science and BigData Certification Questions and Answers

Question : A Data Scientist is assigned to build a model from a reporting data warehouse. The warehouse
contains data collected from many sources and transformed through a complex, multi-stage ETL
process. What is a concern the data scientist should have about the data?



1. It is too processed
2. It is not structured
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4. It is too centralized





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Explanation: Prior to conducting data analysis, the required data must be collected and processed to
extract the useful information. The degree of initial processing and data preparation
depends on the volume of data, as well as how straightforward it is to understand the
structure of the data. Highly processed data may loose some imporatnt information.





Question : Which word or phrase completes the statement? Emphasis color is to standard color as _______ .



1. Main message is to key findings
2. Frequent item set is to item
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4. Pie chart is to proportions



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Explanation: Our brains are compelled to find meaning, whether it is intended or not. Because the eyes are attracted to bright and high-contrast colors, viewers will derive meaning from something that
stands out. When you use color for emphasis, it's like shouting that this object or element has the greatest value. At the Lynda.com site, the bright yellow is used to prominently display their most important message.





Question : Which data asset is an example of semi-structured data?


1. XML data file
2. Database table
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4. News article



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Explanation: 5.3. Semi-Structured Data
idea predates XML but not HTML
data is available electronically in
database systems
file systems, e.g., bibliographic data, Web data
data exchange formats, e.g., EDI, scientific data
attempt to reconcile database and document "worlds"
semi-structured data
organised in semantic entities
similar entities are grouped together
entities in same group may not have same attributes
order of attributes not necessarily important
not all attributes may be required
size of same attributes in a group may differ
type of same attributes in a group may differ
5.4. Example of Semi-Structured Data

name: Peter Wood
email: ptw@dcs.bbk.ac.uk, p.wood@bbk.ac.uk
name:
first name: Mark
last name: Levene
email: mark@dcs.bbk.ac.uk
name: Alex Poulovassilis
affiliation: Birkbeck
5.5. Semi-Structured Data Models

based on labelled graphs rather than labelled trees
used for data exchange among, and integration of, heterogeneous data sources

schema information is in the edge labels
sometimes called schemaless or self-describing
data stored at the leaves

Related Questions

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


1. Key-value pairs
2. Binary respresentation of keys concatenated with structured data
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4. Unique key record and separate records of all possible values




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


1. Any integer
2. Any positive real number
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4. A binary value




Question : A data scientist is given an R data frame, "empdata", with the columns Age, Salary, Occupation,
Education, and Gender. The data scientist would like to examine only the Salary and Occupation
columns for ages greater than 40. Which command extracts the appropriate rows and columns
from the data frame?


1. empdata[c("Salary", "Occupation"), empdata$Age > 40]
2. empdata[Age > 40, ("Salary", "Occupation")]
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4. empdata[, c("Salary", "Occupation")]$Age > 40




Question : What is required in a presentation for business analysts?


1. Operational process changes
2. Budgetary considerations and requests
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4. The presentation author's credentials




Question : What is LOESS used for?

1. It plots a continuous variable versus a discrete variable, to compare distributions across classes.
2. It is a significance test for the correlation between two variables.
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4. It is run after a one-way ANOVA, to determine which population has the highest mean value.




Question : Which word or phrase completes the statement? Mahout is to Hadoop as MADlib is to
____________ .


1. R
2. PostgreSQL
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4. SAS