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How to perform a Z-Test Step by Step on the TI 89 using Statistics Made Easy

Here is a sample problem: A student who works in the blood lab plans to test the hypothesis that the mean cholesterol level of men is less than 230 mg/dL. The population variance of cholesterol level is assumed to be (40 mg/dL)^2. The student tested nine men for cholesterol levels and found the following values… (read more)

Ti Connect software update

Tip of the day: In addition to the familiar TI Connect software – used to transfer TI89 apps from a computer to a TI89 – there now exists TI Connect CE software that only works for TI84 calculators. So if you mistakenly try to transfer ti89 apps using the CE version you will run into… (read more)

How the TI-84 Plus Became Americas Most Popular Graph Calculator – A Brief History

Get These 17 Awesome TI 84 Calculator Games Today!

Stuck on Calc 101 for CSE? We have got the Graph Calculator for You..

TI89.com Update: Right Triangle Checker

New TI89 APPS giveaway puzzle

Cayley Hamilton procedure on the TI89 step by step

The Cayley Hamilton is a nifty procedure to find the inverse of a matrix using the characteristic polynomial of a given square matrix. So no Row Echolon or similar is needed. We just included this Cayley Hamilton in the Linear Algebra Made Easy TI89. Best of all complete steps are shown until the inverse matrix… (read more)

TI89.com for mobile devices

TI89.com is now mobile responsive: once you access www.TI89.com using a cell phone or tablet you will access the mobile TI89.com site. Note: the giveaway puzzle must be accessed on the full (not the mobile) site.

New Giveaway Puzzle at www.ti89.com

Find a new Giveaway Puzzle at the top of www.TI89.com. The first person to solve this one qualifies for a free TI89 app. The solutions to the previous were clever and winners are now happy users of our TI89 apps.