Sometimes, graphic presentation of data uses pictograms instead of bars from bar charts or pie charts. It's best when this information is used one-dimensionally instead of two dimensionally. For example, using the record icon for albums sold is a one dimensional representation, and gives the information correctly. One stack is about 8 records tall (7 full records and a partial record) while the other stack is 5 records tall.
The icon of a gold bar is not as well used, because the bar is made both wider and taller. The ratio between the prices is 741.25/265.50, which is about 2.79, which means the higher price is a little less than three times the lower price. The gold bars have been made both wider and taller, so if we take the ratio of the rectangle sizes (92*54)/(35*21), we have the the big gold bar is about 6.78 times the size of the small one, which is nearer to 2.79*2.79. It's better to represent the information as just a height or just a width and not both, for exactly the reason presented here.
The test will cover material from all the class so far, so reading your notes, reading the online notes and reviewing homework and quizzes is the best use of your time studying.
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