Bar Graphs
What type of data is best represented using a bar graph?
Categorical data
When should you use a line graph?
When showing trends or changes over time.
What does a pie chart represent?
Parts of a whole, shown as percentages.
What type of data is best represented by a histogram?
Continuous data grouped into intervals.
What happens if bar widths in a bar graph are unequal?
The graph becomes misleading.
What is placed on the X-axis of a bar graph?
The independent variable
What is plotted on the X-axis of a line graph?
The independent variable, usually time.
What is the total angle of a pie chart?
360 degrees.
How are histograms different from bar graphs?
Histograms show continuous data, and their bars touch.
What is wrong if the scale on a line graph is uneven?
It distorts the trend of the data.
What is a key rule about bar width in a bar graph?
All bars must have the same width.
Why is it important to connect the points with a smooth line?
To accurately show the trend or pattern in the data.
How do you calculate the angle for each section of a pie chart?
ANGLE = (CATEGORY)/(TOTALVALUE) xx 360^0
What is placed on the X-axis of a histogram?
Intervals (bins) representing data ranges.
Why should you avoid using too many colors in a graph?
It can make the graph confusing and hard to interpret.
Name one common mistake made when drawing a bar graph.
Unequal bar widths, inconsistent spacing, missing labels or units.
What should be avoided when drawing a line graph?
Uneven spacing on axes, jagged/disconnected lines, missing labels.
What is a key mistake to avoid when making a pie chart?
Data not adding up to 100% or incorrect angle calculations.
What mistake should be avoided when making a histogram?
Unequal bin widths, gaps between bars, or unclear labels.
What happens if a pie chart's total does not add up to 100%?
The data representation is inaccurate.
When comparing multiple datasets on a bar graph, what should you include?
A legend (key) to differentiate the data sets.
What is the purpose of a legend in a line graph?
To distinguish between multiple data sets being compared.
Why is it best to limit a pie chart to 5-6 categories?
Too many categories make the chart difficult to read.
Why should you avoid using too many or too few bins?
Too many bins make the data messy; too few hide patterns.
Why is it important to always include axis labels?
So the reader knows what each axis represents.