Data collection in our world

To track people's online activities and interests, which method of data collection is most effective?

A. Observations

B. Cookies

C. Interviews

D. Surveys

Explain: To track people's online activities and interests, cookies are most effective.

Determining what data to collect

Question 1

In instances when collecting data from an entire population is challenging, data analysts may choose to use what?

A. A specimen

B. A sample

C. A selection

D. A segment

The correct answer is B. A sample. Explain: In instances when collecting data from an entire population is challenging, data analysts may choose to use a sample. A sample is a part of a population that is representative of that population.

Question 2

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.

• Creating data visualizations
• Determining the time frame
• Choosing data sources
• Analyzing the data to answer business questions

Explain: Determining the time frame and choosing data sources are steps in the data collection process.

Discover data formats

Discrete data isn't limited to dollar amounts. Examples of other discrete data are stars and points. When partial measurements (half-stars or quarter-points) aren't allowed, the data is discrete. If you don't accept anything other than full stars or points, the data is considered discrete.

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.

• Ordinal
• Continuous
• Nomial
• Discrete

Explain: The star rating is an example of ordinal data because the number of stars are in order of how much each person liked the movie. It’s also an example of discrete data because a person has to choose a full star measure; half-stars weren’t an option.

The use of external data is particularly valuable in which circumstances?

A. When analysis requires a lot of structured data

B. When analysis depends on as many data sources as possible

C. When analysis includes data from audio files

D. When analysis involves data that hasn’t been cleaned

The correct answer is B. When analysis depends on as many data sources as possible. Explain: External data is particularly valuable when an analysis depends on as many sources as possible.

Data table components

When discussing structured databases, data analysts refer to the data contained in a row as a record. How do they refer to the data contained in a column?

A. Point

B. Character

C. Subject

D. Field

Explain: Data analysts refer to the data contained in a column as a field.