EBTM 350 - MIDTERM (QUIZZES 1-3) EXAM QUESTIONS
AND ANSWERS WITH COMPLETE SOLUTIONS VERIFIED
Which of the following are reasons for data professionals to learn data wrangling
skills?
Analytics professionals need broader skill sets than data mining techniques
Analytics professionals are superior to all other IT professionals
Organizations will be able to make decisions more rapidly
Analytics professionals can no longer rely on the IT department to provide data
Analytics professionals need broader skill sets than data mining techniques
Organizations will be able to make decisions more rapidly
Analytics professionals can no longer rely on the IT department to provide data
T/F: A relational database consists of one or more logically related data files,
where each data file is a two-dimensional grid that consists of rows and columns.
True
An entity-relationship diagram (ERD) is a graphical representation used to
illustrate the structure of the data. An '______' is a generalized category to
represent persons, places, things, or events about which we want to store data in
a database table. A single occurrence of an entity is called an '______'
Entity
Instance
, Recall Organic Food Superstore from the introductory case; In that case, an
Entity Relationship Diagram (ERD) for the store illustrates three
entities:CUSTOMER, ORDER, and PRODUCT. The relationship between
CUSTOMER and ORDER entities is 1:M because:
Each order can only belong to one customer
The most popular query language used today is _________. This popular query
language is used for manipulating data in a relational database using relatively
simple and intuitive commands.
SQL
According to interviews and expert estimates, analytics professionals spend from
__________ of their time in the mundane task of collecting and preparing unruly
data, before analytics can be applied (The New York Times ,August 17, 2014).
up to 95%
Data '_______' is a process that an organization uses to acquire, organize, store,
manipulate, and distribute data
Management
T/F: Data in a data mart are organized using a multidimensional data model called
a star schema, which includes dimension and fact tables.
True
Which of the following is NOT a correct statement about entity-relationship
diagram (ERD) attributes?
An entity is a generalized category to represent persons, places, things, or
AND ANSWERS WITH COMPLETE SOLUTIONS VERIFIED
Which of the following are reasons for data professionals to learn data wrangling
skills?
Analytics professionals need broader skill sets than data mining techniques
Analytics professionals are superior to all other IT professionals
Organizations will be able to make decisions more rapidly
Analytics professionals can no longer rely on the IT department to provide data
Analytics professionals need broader skill sets than data mining techniques
Organizations will be able to make decisions more rapidly
Analytics professionals can no longer rely on the IT department to provide data
T/F: A relational database consists of one or more logically related data files,
where each data file is a two-dimensional grid that consists of rows and columns.
True
An entity-relationship diagram (ERD) is a graphical representation used to
illustrate the structure of the data. An '______' is a generalized category to
represent persons, places, things, or events about which we want to store data in
a database table. A single occurrence of an entity is called an '______'
Entity
Instance
, Recall Organic Food Superstore from the introductory case; In that case, an
Entity Relationship Diagram (ERD) for the store illustrates three
entities:CUSTOMER, ORDER, and PRODUCT. The relationship between
CUSTOMER and ORDER entities is 1:M because:
Each order can only belong to one customer
The most popular query language used today is _________. This popular query
language is used for manipulating data in a relational database using relatively
simple and intuitive commands.
SQL
According to interviews and expert estimates, analytics professionals spend from
__________ of their time in the mundane task of collecting and preparing unruly
data, before analytics can be applied (The New York Times ,August 17, 2014).
up to 95%
Data '_______' is a process that an organization uses to acquire, organize, store,
manipulate, and distribute data
Management
T/F: Data in a data mart are organized using a multidimensional data model called
a star schema, which includes dimension and fact tables.
True
Which of the following is NOT a correct statement about entity-relationship
diagram (ERD) attributes?
An entity is a generalized category to represent persons, places, things, or
