CHAPTER 18. STATISTICS 18.6
Exercise 18 - 6
The bar graph below shows the results of a study that looked at the cost of food compared to the
income of a householdin 1994.
0
2
4
6
8
10
12
.
<
5
5-10 10-15 15-20 20-30 30-40 40-50 >
50
Income in 1994 (in thousands of rands)Food bill (in thousandsof rands)Income (thousands of rands) Food bill (thousands ofrands)
< 5 2
5 − 10 2
10 − 15 4
15 − 20 4
20 − 30 8
30 − 40 6
40 − 50 10
> 50 12- What is the dependent variable? Why?
- What conclusion canyou make about this variable? Why? Does this make sense?
- What would happenif the graph was changedfrom food bill in thousands of rands to percentage
of income? - Construct this bar graph using a table. What conclusions can be drawn?
- Why do the two graphs differ despite showing the same information?
- What else is observed? Does this affect the fairness of the results?