Practice Test
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What types of data displays do you know?
Example Solution: Histogram, see solution.
Let's recall the types of data displays we can use to describe a data set.
| Data Display | When Do We Use It? | Key Phrase |
|---|---|---|
| Pictograph | To show data using pictures | Pictures |
| Dot Plot | To show the number of times each value occurs in a data set | Times each value occurs |
| Stem-and-Leaf Plot | To show how ordered numerical data are distributed | Distribution of ordered values |
| Box-and-Whisker Plot | To show the variability of a data set by using quartiles | Variability |
| Circle Graph | To show data as parts of a whole | Parts of a whole |
| Bar Graph | To show frequencies of data values in specific categories | Category frequency |
| Histogram | To show frequencies of data values in intervals of the same size | Frequency and intervals |
| Line Graph | To show how data change over time | Change over time |
| Scatter Plot | To show the relationship between two data sets using ordered pairs plotted in a coordinate plane | Relationship of two data sets, coordinate plane |
Now, we want to choose an appropriate data display for the following situation.
|
Magazine sales grouped by price range |
Here we want to present the frequency — magazine sales — that fall into a specific category — price range. This means that we could use a histogram. Remember that, for a histogram, the prices should be expressed as intervals of the same size. The histogram for this situation could look like the following.
