# Introduction to Probability

In this activity, you will have the opportunity to explore events that occur together and determine if they are independent events or dependent events.

Before we can calculate the probability of an event occurring, we need to determine if that event is independent or dependent.

Events are considered independent when the occurrence of one event has no effect on the occurrence of another.

Events are considered dependent when the occurrence of one of the events affects the occurrence of the other.

Use the interactive below to determine if each problem describes independent events or dependent events.

Card Sort ActivityThe card activity allows you to sort independent and dependent events.

Consider the following reflection questions:

- What are some of the ways that you are able to determine if events are dependent?
- How do situations with replacement differ from those without replacement?
- What are some additional examples of situations where you need specification on whether or not there is replacement to determine dependence or independence of events?

The next activity will provide an opportunity to explore how to determine the probability of independent events.