01
True or false
1 point
Exploratory data analysis uses summaries and visualizations to examine a dataset before drawing conclusions or building a formal model.
Free Practice Quiz Question List
7 Exploratory Data Analysis Online Quiz Questions
Use this free practice quiz with 20 questions to review 7 Exploratory Data Analysis, test your knowledge, and prepare for your next test or exam.
20 questions
02
Choose one
1 point
A researcher wants to compare the typical value and variation of a numerical measurement across four departments. Which display is suited to this comparison?
- A
A time-series plot
- B
Side-by-side box plots
- C
A scatterplot matrix
- D
A histogram of all values combined
03
Fill in the blank
1 point
Exploratory data analysis can reveal in a dataset and help formulate questions for further investigation.
04
Written response
1 point
What summary statistic can be calculated for two numerical variables when their relationship is roughly linear?
05
True or false
1 point
If a point appears far from the main cloud in a scatter plot, it should automatically be removed before any further analysis.
- A
True
- B
False
06
Choose one
1 point
A clinic records the number of daily patient visits and wants to look for trends, cycles, abrupt shifts, or gaps over several months. Which display should it use?
- A
A time-series plot
- B
A scatterplot matrix
- C
Side-by-side box plots
- D
A dot plot with categories on the horizontal axis
07
Fill in the blank
1 point
When investigating an unusual value, check the original record, units, data-entry process, and relevant .
08
Written response
1 point
What display provides a quick view of pairwise patterns when a dataset contains several numerical variables?
09
Choose all
1 point
A team plots two numerical variables in a scatter plot. Select all features of the data the plot could help reveal.
- A
Whether the variables have a curved pattern
- B
Whether one variable causes the other
- C
Whether the spread changes across the range
- D
The exact reason any isolated point occurred
10
Choose one
1 point
A histogram shows one measurement far out in the upper tail. What is the most appropriate next step?
- A
Assume it is a data-entry error and delete it
- B
Treat it as proof that the entire dataset is unreliable
- C
Check its record and context before deciding whether it is an error or a valid unusual case
- D
Replace it with the median so it no longer affects summaries
11
Choose all
1 point
A scatter plot shows that cold-drink sales tend to rise with daily temperature, with a few unusually low-sales days. Select all follow-up questions that are specific and testable using additional data or comparisons.
- A
Do unusually low sales days occur more often when a store is closed or its records are missing?
- B
Does the scatter plot prove that warmer weather causes higher sales?
- C
Does the relationship between temperature and sales differ by season?
- D
Are sales interesting?
12
Choose one
1 point
A researcher reports a weak correlation between two numerical variables, but the scatter plot shows a clear curved pattern. What is the best interpretation?
- A
The correlation necessarily proves that one variable causes the other
- B
The relationship may be curved, which a single correlation can fail to describe
- C
The variables cannot be plotted together because they are numerical
- D
The correlation gives the exact value of every observation
13
Open ended
1 point
A retailer observes that cold-drink sales tend to rise on warmer days, but the pattern may differ by season and a few days have unusually low sales. Describe an EDA plan for exploring these data. Include an appropriate plot, how you would investigate the unusual days, and one conclusion the observed association alone cannot justify.
14
True or false
1 point
Exploration is more useful when visible patterns are connected to a clear problem and used to develop focused questions for further analysis.
- A
True
- B
False
15
Choose one
1 point
An analyst wants an initial visual overview of pairwise relationships among six numerical measurements. Which display is the best fit?
- A
A scatterplot matrix
- B
A single time-series plot
- C
A box plot of one variable
- D
A dot plot comparing categories of one variable
16
Choose one
1 point
A researcher wants to compare the typical values and variation of a numerical measurement across several categories. Which graph is a suitable choice?
- A
A time-series plot
- B
Side-by-side box plots
- C
A scatterplot matrix
- D
A scatter plot
17
Choose one
1 point
A team has measurements collected in time order and wants to look for trends, cycles, abrupt shifts, or gaps. Which graph should it use?
- A
A scatterplot matrix
- B
Side-by-side box plots
- C
A time-series plot
- D
A histogram
18
Written response
1 point
What term describes an observation or pattern that differs noticeably from the rest of the data?
19
Choose one
1 point
A scatter plot of two numerical variables shows two clearly separated clusters of points. What is a reasonable interpretation to investigate?
- A
The variables must have a causal relationship.
- B
The data may contain distinct groups or follow different patterns.
- C
The two variables are unrelated because the points are not in one cloud.
- D
The clusters should be removed before further analysis.
20
Written response
1 point
A scatter plot shows that two variables tend to change together, but the plot does not establish that either variable causes the other. What is the term for this observed relationship?