We are asked to identify some statistical terms based on their descriptions. I will specifically address the last question related to the ogive chart. "The difference between the lower and upper quartiles of an ogive."

1. Problem Description

We are asked to identify some statistical terms based on their descriptions. I will specifically address the last question related to the ogive chart.

"The difference between the lower and upper quartiles of an ogive."

2. Solution Steps

The ogive chart is a graphical representation of a cumulative distribution. The lower quartile (Q1) represents the 25th percentile of the data, and the upper quartile (Q3) represents the 75th percentile. The difference between the upper and lower quartiles (Q3 - Q1) is known as the interquartile range (IQR).

$IQR = Q3 - Q1$

The interquartile range measures the spread of the middle 50% of the data and is a robust measure of variability, less sensitive to outliers than the range.

3. Final Answer

The difference between the lower and upper quartiles of an ogive is the Interquartile Range (IQR).