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WorksheetsUnderstanding Charts and Graphs
Total questions: 20
Worksheet time: 10mins
What is the main purpose of a bar chart?
To show relationships between two variables
To compare categories of data
To show data distribution in ranges
To calculate averages
In a histogram, the x-axis usually represents:
Categories
Continuous ranges (intervals)
Percentages
Text labels
Which type of chart is best for showing the relationship between two numeric variables?
Histogram
Scatter plot
Bar chart
Cross tab
If you want to count how many students got scores between 70–80, which chart is best?
Scatter plot
Histogram
Bar chart
Cross tab
In a bar chart, the height of each bar shows:
The category label
The size or frequency of the category
The mean value of the data
The total sum of all data
Which chart is useful when you have data in two columns like “Age” and “Favorite Drink”?
Histogram
Scatter plot
Cross tab
Line chart
What makes a histogram different from a bar chart?
Histogram bars do not touch
Histogram uses categories instead of ranges
Histogram bars are grouped into intervals that touch
Histogram is always colorful
Which of the following is an example of categorical data?
Age in years
Height in cm
Favorite sport
Exam score
A scatter plot with points going upward from left to right shows:
Negative correlation
Positive correlation
No correlation
Random values
A cross tab is best used when:
You want to show percentages only
You compare two categorical variables
You need to calculate averages
You want to visualize only one variable
If data is grouped into bins of “10–20, 20–30, 30–40”, the chart is:
Bar chart
Scatter plot
Histogram
Cross tab
Which chart type is best to show “Most popular social media apps among students”?
Histogram
Bar chart
Scatter plot
Cross tab
In a scatter plot, each dot represents:
A category
A range of values
A single data point with two values (x, y)
A frequency count
What is a similarity between bar charts and histograms?
Both use categories only
Both use bars to show frequency
Both require two variables
Both always have equal bar widths
Which chart would be most useful to see if “Hours of study” affects “Test score”?
Bar chart
Histogram
Scatter plot
Cross tab
In a cross tab table, the rows usually represent:
Categories of the first variable
Ranges of values
Percentages
Random samples
If the histogram bars are very tall on the left and very short on the right, this means:
Most data values are small
Most data values are large
All values are the same
The chart is incorrect
Why do people use data visualizations like charts?
To make data more confusing
To hide the real numbers
To make patterns easier to see
To avoid using tables
Which chart would you choose to display “Number of boys and girls in a class”?
Histogram
Bar chart
Scatter plot
Cross tab
In a cross tab comparing “Gender” and “Favorite Pet”, each cell shows:
The average number of pets
The number of students for each combination
The total number of pets in school
The percentage of boys only
