01
True or false
1 point
True or false: A bit can represent either 0 or 1.
Free Practice Quiz Question List
8. From Data to Insight Online Quiz Questions
Use this free practice quiz with 20 questions to review 8. From Data to Insight, test your knowledge, and prepare for your next test or exam.
20 questions
02
Choose one
1 point
Which description best matches lossy compression?
- A
A method that always preserves every original detail
- B
A method that may discard information to reduce file size
- C
A method used only for spreadsheets
- D
A method that converts decimal numbers to binary
03
Choose one
1 point
A school wants to determine how to reduce cafeteria food waste. Which data would be most directly relevant while avoiding unnecessary personal information?
- A
Students' names
- B
The amount of food discarded each day
- C
Students' favorite colors
- D
The brand of each student's backpack
04
Choose one
1 point
What decimal value does the binary number 10110 represent?
- A
18
- B
20
- C
22
- D
26
05
Choose one
1 point
A device stores a category code in one byte. How many distinct bit patterns could that byte represent?
- A
8
- B
64
- C
256
- D
512
06
Choose all
1 point
Which two practices are appropriate when handling missing values in a dataset? Select all that apply.
- A
A blank value and a measured zero can have different meanings.
- B
A blank value should always be changed to zero.
- C
The amount and meaning of missing data should be considered in the analysis.
- D
A blank value proves that the measured quantity was zero.
07
Choose all
1 point
Which three actions belong in a trustworthy data-cleaning workflow? Select all that apply.
- A
Determine what rows and columns represent.
- B
Standardize equivalent dates, labels, and units.
- C
Automatically delete every unusually large or small value.
- D
Record what was changed, why, and how many records were affected.
08
True or false
1 point
True or false: If two variables are strongly correlated, the data alone proves that one variable causes the other.
- A
True
- B
False
09
True or false
1 point
True or false: A chart whose vertical axis begins at 97 can make a change from 98 to 100 appear larger than it is in absolute terms.
- A
True
- B
False
10
Written response
1 point
A sensor records each reading using 8 bits. How many distinct bit patterns are available? Enter the whole-number value.
11
Written response
1 point
Standardize the date 1/5/26 using the convention shown in the material. Enter the full date in YYYY-MM-DD format.
12
Fill in the blank
1 point
Complete each statement with the most appropriate display. To show how a value changes over time, use a . To examine whether two numeric variables are related, use a .
13
Fill in the blank
1 point
Complete each statement with the relevant responsible-data principle. Using data only for the purpose originally explained is called . Deciding when data should be deleted or anonymized concerns .
14
Open ended
1 point
A city wants to understand delays on a bus route. Describe an end-to-end data workflow that would produce a defensible analysis and communicate the results responsibly. Include the question, data collection, representation, cleaning, exploration, visualization, interpretation, limitations, and privacy considerations.
15
Choose one
1 point
A computer stores one byte as eight bits. How many different bit patterns can that byte represent?
- A
8
- B
256
- C
512
- D
1,024
16
Choose one
1 point
A researcher must archive a scientific dataset so that every original value can be recovered exactly. Which approach is most appropriate?
- A
Lossy compression, because it always produces the smallest file
- B
Lossy compression, because it removes redundant information
- C
Lossless compression, because it permits exact reconstruction
- D
Either method, because both preserve every original value
17
Choose one
1 point
A survey dataset contains blank responses, but the analyst does not know whether participants skipped the question or whether the question did not apply. What is the best first step?
- A
Leave it missing or handle it using a justified method after determining what the blank means
- B
Replace every blank with zero so calculations can proceed
- C
Delete the entire dataset because any missing value makes analysis impossible
- D
Treat every blank as evidence that the measured quantity was zero
18
Choose one
1 point
A transit analyst wants to show how the average delay on a bus route changes from hour to hour during one day. Which visualization is the best initial choice?
- A
Pie chart
- B
Histogram
- C
Scatter plot
- D
Line chart
19
Written response
1 point
Convert the binary number 10110 to its decimal value. Enter the decimal value as a whole number.
20
Written response
1 point
What compression method should be used for a legal record when the exact original data must be recoverable? Enter the compression method as a concise technical term.