What is the Difference Between Discrete and Continuous Distributions?

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The main difference between discrete and continuous probability distributions lies in the nature of the values that the random variables can take on.

Discrete Distributions:

  1. Discrete distributions are probability distributions where the random variable can only take on a finite or countable number of values.
  2. Discrete variables can only assume one of a countable (usually finite) number of values.
  3. For example, the number of heads in a coin flip or the number of clicks on a webpage in an hour can be considered discrete variables.
  4. Discrete probability distributions can be presented in tabular form, with each possible value of the discrete random variable associated with a non-zero probability.

Continuous Distributions:

  1. Continuous distributions are probability distributions where the random variable can take on any value within a certain range or interval.
  2. Continuous variables can assume one of an infinite (uncountable) number of values.
  3. Examples of continuous variables include height, weight, or temperature.
  4. Continuous distributions are described in terms of probability density, which can be converted into the probability that a value will fall within a certain range.

In summary, discrete distributions involve random variables with a limited set of possible values, while continuous distributions involve random variables with an infinite number of possible values within a given range.

Comparative Table: Discrete vs Continuous Distributions

Here is a table comparing the differences between discrete and continuous distributions:

Feature Discrete Distributions Continuous Distributions
Definition A discrete distribution is one in which data can only take on certain values, typically integers. A continuous distribution is one in which data can take on any value within a specified range.
Values Discrete data can only take on specific, countable values. Continuous data can take on any value within a specified range, making it quantifiable rather than countable.
Probability In a discrete distribution, each possible value can be associated with a non-zero probability. The probability that a continuous random variable will assume a particular value is zero.
Probability Distribution Discrete probability distributions describe probabilities associated with discrete variables. Continuous probability distributions describe probabilities associated with continuous variables.
Examples Examples of discrete distributions include the number of children in a household, the number of clicks on a webpage in an hour, and the number of items sold in a day. Examples of continuous distributions include heights of people, weights of objects, and temperatures of a room.

In summary, discrete distributions have specific, countable values with non-zero probabilities, while continuous distributions have values that can take on any value within a specified range and have a probability of zero for any particular value.