Final answer:
The interquartile range is a statistical concept, it is the difference between the upper quartile (Q3) and the lower quartile (Q1). It measures where the 'middle half' of a set of data lies. To calculate it, you identify Q3 and Q1 from the dotplot, and subtract Q1 from Q3.
Step-by-step explanation:
The interquartile range is a measure of statistical dispersion, which is equal to the difference between the upper and lower quartiles. In other words, it is the range within which the middle 50% of your data points fall. In this context, the interquartile range of the file size distribution illustrated in the dotplot can be calculated by the following steps:
- Identify the upper quartile (Q3), the point separating the top 25% of the data from the rest.
- Identify the lower quartile (Q1), the point separating the bottom 25% of the data from the rest.
- Subtract: Interquartile range = Q3 - Q1. The result is your interquartile range.
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