So far we have covered a range of different chart types for representing data. In this final topic, we consider various other charts, including pictograms, sector graphs (pie charts), line graphs, and divided bar charts.
The type of chart we choose will depend primarily on the type and size of the data.
|stem-and-leaf plot||divided bar chart|
|line graph||sector graph (pie chart)|
|frequency polygon||bar chart|
The grouped bar chart shows customer satisfaction ratings for different cars, broken down by gender. The red rows represent males; the blue rows, females.
Which of the following statements are true?
Honda received the highest ratings.
Ford received the lowest ratings among Males.
Both genders agree on the rank order in which the cars are rated.
As a group, the women seem to be tougher raters; they gave lower ratings to each car than the men gave.
Females prefered the cars that were red.
The graph represents the number of iTunes sales (in millions) and iPod sales (in hundreds of thousands) every 3 months between 2003 and 2007.
How many iTunes sales were there in the first quarter of 2006 (2006 Q1)?
How many iPod sales were there in the first quarter of 2006?
How many more iTunes sales were there than iPod sales in the first quarter of 2007?
How many iTunes sales were there in 2006?
Charts are often used in the media to show comparisons and describe trends. At times, they are also used to misrepresent information and promote a biased view.
Some of the ways in which a chart can be misleading include:
The Australian Labour Party released this graph after Tony Abbot was elected as Prime Minister.
Which of the following comments apply:
represents information in symbolic, graphical and tabular form
develops and carries out simple statistical processes to answer questions posed