Conditional Probability TI-84 | TI-83 Example

Joestat wants you to help you complete the following conditional probability example using your TI-84 and TI-83 calculator.  What is the  probability that someone drinks a diet given they drink coke.  This is an example of conditional probability, so we will use the conditional probability formula.

Results from the Favorite Beverage Survey from Bob’s Class

Pepsi Coke Other
Diet 35 30 25
Regular 40 ? 20

 

Solution:
First, add totals to the table:

Results from the Favorite Beverage Survey from Bob’s Class

Pepsi Coke Other Total
Diet 35 30 25 90
Regular 40 ? 20 110
Total 75 80 45 200

Second, use the Conditional Probability Formula:

Remember this for the conditional probability problem P(diet | Coke) = frac{P(diet and Coke)}{P(Coke)}

Conditional Probability example for diet given a coke latex P(diet | Coke) = frac{P(diet and Coke)}{P(Coke)}

(30/200)/(80/200) =3.75

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Condiitonal Probability TI-84 or TI-83 procedure

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Last Modified on September 7, 2013 by JoeStat

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