How to Find P Values Using a Texas Instruments TI-83 Calculator

By Morgan Owens
Brianne Campbell/Demand Media

The field of statistics uses a number called the probability value (“p-value”) to describe the percentage likelihood that the results of a research study occurred by chance. Ronald A. Thisted, a professor of statistics at the University of Chicago, describes the p-value as a number that “measures consistency between the results actually obtained in the trial and the ‘pure chance’ explanation for those results.” The TI-83, a graphing calculator manufactured by Texas Instruments, is capable of calculating the p-value for a normal distribution, student’s t-distribution and chi-square distribution.

Step 1

Brianne Campbell/Demand Media

Press the “On” button.

Step 2

Brianne Campbell/Demand Media

Press the button labeled “2nd” and then the button labeled “VARS” to access the distribution menu.

Step 3

Brianne Campbell/Demand Media

Press the number “2” to select the second option on the menu, “normalcdf,“ to calculate the p-value of a normal distribution. Press the number “5” to select the fifth option on the menu, “tcdf,“ to calculate the p-value for a student’s t-distribution. Press the number “7” to select the seventh option on the menu, “X^2cdf,” to calculate the p-value for a chi-square distribution.

Step 4

Brianne Campbell/Demand Media

Enter the lower bound of the data set.

Step 5

Brianne Campbell/Demand Media

Insert a comma.

Step 6

Brianne Campbell/Demand Media

Enter the upper bound of the data set.

Step 7

Brianne Campbell/Demand Media

Insert a comma.

Step 8

Brianne Campbell/Demand Media

Enter the mean of the data set.

Step 9

Brianne Campbell/Demand Media

Insert a comma.

Step 10

Brianne Campbell/Demand Media

Enter the standard of deviation of the data set.

Step 11

Brianne Campbell/Demand Media

Press “Enter.”

About the Author

Morgan Owens has a Bachelor of Science in criminal justice, and minors in biology and psychology. She attended Boston University and is currently applying to law school for matriculation in 2014. Her articles have been published on numerous informational websites.