### Question

In the context of this exercise, what do the horizontal and vertical axes represent in a KDE plot?

### Answer

For this lesson, the KDE plots we work will be using univariate data. So, only one of the axes will represent actual values in the data.

The **horizontal or x-axis** of a KDE plot is the range of values in the data set. This is similar to the x axis for histograms.

The **vertical or y-axis** of a KDE plot represents the **Kernel Density Estimate** of the **Probability Density Function** of a random variable, which is interpreted as a probability differential. The probability of a value being between the points `x1`

and `x2`

is the total shaded area of the curve under the two points.