Random Variable |
---|
A random variable is a variable which has its value determined by a probability experiment. |
If you flip a coin once, how many tails could you come up with? Let's create a new random variable called "T". "T" represents the number of tails possible from our probability experiment. After flipping a coin once (a probability experiment), T's value will be either 1 or 0. T is a random variable.
Discrete Random Variable |
---|
A discrete random variable is a random variable which has a finite number of values. |
Let’s say you flip a coin six times. How many tails could you come up with?
Figure 1. |
---|
There are a finite number of possible values. Values such as "1.5" or "2.5923" don’t make sense for this type of problem.
Continuous Random Variable |
---|
A continuous random variable is a random variable which has an infinite number of values. |
Let’s say you measure the speed (in miles per hour) of the first car to drive by your house. What kind of values could you obtain?
Figure 2. |
---|
Maybe the car is going 25mph, or 50mph, or 62.00252mph. The variable (speed) can take on an infinite number of values.