Cookies
To track people's online activities and interests, which method of data collection is most
... [Show More] effective?
Cookies
Surveys
Interviews
Observations
A sample
In instances when collecting data from an entire population is challenging, data analysts may choose to use what?
A segment
A specimen
A sample
A selection
Brainpower
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Determining the time frame
Choosing data sources
The data-collection process involves deciding what data to use, determining how much data to collect, and selecting the right data type. Which of the following are also steps in the data-collection process? Select all that apply.
Determining the time frame
Creating data visualizations
Analyzing the data to answer business questions
Choosing data sources
Data that includes dates
What is time series data?
Observations
Which method of data-collection is most commonly used by scientists?
Interviews
Observations
Questionnaires
Surveys
Second-party data
Organizations such as the U.S. Centers for Disease Control (CDC) often use data collected from hospitals. What kind of data is the CDC using if it is collected by hospitals, then sold to the CDC for its own analysis?
Third-party data
First-party data
Multiple-party data
Second-party data
population
Fill in the blank: In data analytics, a _____ refers to all possible data values in a certain dataset.
source
representation
population
sample
Discrete
Ordinal
An entertainment website displays a star rating for a movie based on user reviews. Users can select from one to five whole stars to rate the movie. The star rating is an example of what type of data? Select all that apply.
Discrete
Continuous
Nominal
Ordinal
When analysis depends on as many data sources as possible
The use of external data is particularly valuable in which circumstances?
When analysis involves data that hasn't been cleaned
When analysis depends on as many data sources as possible
When analysis includes data from audio files
When analysis requires a lot of structured data
Primary data
What type of data is this?
Collected by a researcher from first-hand sources
- Data from an interview you conducted
- Data from a survey returned from 20 participants
- Data from questionnaires you got back from a group of workers
Secondary data
What type of data is this?
Gathered by other people or from other research
- Data you bought from a local data analytics firm's customer profiles
- Demographic data collected by a university
- Census data gathered by the federal government
Internal data
What type of data is this?
Data that lives inside a company's own systems
- Wages of employees across different business units tracked by HR
- Sales data by store location
- Product inventory levels across distribution centers
External data
What type of data is this?
Data that lives outside of a company or organization
- National average wages for the various positions throughout your organization
- Credit reports for customers of an auto dealership
Continuous data
What type of data is this?
Data that is measured and can have almost any numeric value
- Height of kids in third grade classes (52.5 inches, 65.7 inches) - Runtime markers in a video
- Temperature
Discrete data
What type of data is this?
Data that is counted and has a limited number of values
- Number of people who visit a hospital on a daily basis (10, 20, 200)
- Room's maximum capacity allowed
- Tickets sold in the current month
Qualitative data
What type of data is this?
Subjective and explanatory measures of qualities and characteristics
- Exercise activity most enjoyed
- Favorite brands of most loyal customers
- Fashion preferences of young adults
Quantitative data
What type of data is this?
Specific and objective measures of numerical facts
- Percentage of board certified doctors who are women
- Population of elephants in Africa
- Distance from Earth to Mars
Nominal data
What type of data is this?
A type of qualitative data that isn't categorized with a set order
- Yes, No, Unsure
- First time customer, returning customer, regular customer
- New job applicant, existing applicant, internal applicant
- New listing, reduced price listing, foreclosure
Ordinal data
What type of data is this?
A type of qualitative data with a set order or scale
- Movie ratings (number of stars: 1 star, 2 stars, 3 stars)
- Ranked-choice voting selections (1st, 2nd, 3rd)
- Income level (low income, middle income, high income)
Structured data
What type of data is this?
Data organized in a certain format, like rows and columns
- Expense reports
- Tax returns
- Store inventory
Unstructured data
What type of data is this?
Data that isn't organized in any easily identifiable manner
- Social media posts
- Emails
- Videos
Entity Relationship Diagram (ERD)
a visual way to understand the relationship between entities in the data model.
Unified Modeling Language (UML)
very detailed diagrams that describe the structure of a system by showing the system's entities, attributes, operations, and their relationships.
Data modeling
The process of creating diagrams that visually represent how data is organized and structured
Continuous
Fill in the blank: The running time of a movie is an example of _____ data.
qualitative
continuous
nominal
discrete
Is not organized
May have an internal structure
What are the characteristics of unstructured data? Select all that apply.
Is not organized
Fits neatly into rows and columns
Has a clearly identifiable structure
May have an internal structure
Store
Search
Analyze
Structured data enables data to be grouped together to form relations. This makes it easier for analysts to do what with the data? Select all that apply.
Store
Search
Rewrite
Analyze
Email message
Which of the following is an example of unstructured data?
Rating of a local favorite restaurant
Contact saved on a phone
Email message
GPS location [Show Less]