A column graph is a graph with a horizontal axis (the x-axis), a vertical axis (the y-axis) and separated rectangular bars that indicate discrete data.
Of the two variables in bar graphs, the independent variable is the one on which the other variable depends. The independent variable goes on the horizontal axis and a common example is the months of the year. The dependent variable is written on the vertical axis and a common example includes the frequency.
Some important tips are:
The number of murders in one week in Honduras, Central America:
|NUMBER OF MURDERS|
In 2010, Honduras in Central America had almost the highest rate of intentional homicide in the world. There were about 6240 murders. This is approximately 17 murders per day! Sadly, Southern Africa's murder rate was even higher.
|NAME OF MUSICIAN|
|NUMBER OF ALBUM SALES|
|Elvis Presley||600 million|
|Michael Jackson||350 million|
|Led Zeppelin||250 million|
|NAME OF PEPPER|
|Peter pepper||10 000|
|Tabasco pepper||30 000|
|Bird's eye chilli||50 000|
|Habanero chilli||100 000|
The table above shows part of the Scoville Scale for the "hotness" of peppers (chillies). The units are Scoville Heat Units (SHU). Draw a column graph of this data. (Hint: Go up by 5000s on the vertical axis.)
On the Scoville Scale, the pepper spray used by police is over 500 000 SHU.