## TI-83 Calculator Tutorials

When I showed up at my Statistics midterm, many of the students were freaking out - not over the material itself, but over how to use their calculators properly. I was glad I had read the entire TI-83 Plus Manual, front cover to back.

normalpdf(x,?,?)

**Command Syntax**

invNorm(*percentile*[,*?*, *?*])

**Menu Location**

Press:

- 2ND DISTR to access the distribution menu
- 3 to select invNorm(, or use arrows.

**Example:** Suppose X represents the scores on an exam and is normally distributed with mean 85 and standard deviation 10.

We want to find the value of x such that 90% of the distribution is below it. This means we are looking for the 90th percentile.

1) Press 2nd DISTR 3. This brings up InvNorm(

2) Type .90 comma 85 comma 10

3) Press ) button.

4) Press ENTER

The value you get is the 90th percentile for X.

**Menu Location**

Press:

- 2ND DISTR to access the distribution menu
- 2 to select normalcdf(, or use arrows.

normalcdf( start, end, mean, std_dev)

**For the standard normal distribution: normalcdf(-1,1**

**For the normal distribution with mean 10 and std. dev. 2.5:** normalcdf(5,15,10,2.5

Disclaimer: I did not create nor do I own these videos. I have simply embedded them, courtesy of YouTube.

Disclaimer: I did not create nor do I own these videos. I have simply embedded them, courtesy of YouTube.

Disclaimer: I did not create nor do I own these videos. I have simply embedded them, courtesy of YouTube.

Command: invNorm(.75,46,2.7)