Statistics

[Jdban101]

I am trying to run a statistics test in the stat application, and the calculator wants me to tell it where the data is. Is there a faster way than actually typing out the word "list1". I remember my old ti83 had buttons for L1 ,L2, etc. Is there any way to do something similar here?

[Jdban101]

Also, how do I write dx, as in the integral of 3x dx?

[Jdban101]

Oh, I figured out the dx. Is there a way to have the TI 89 show me how it integrated the equation? I have heard that you can make it show its steps.

[mellamokb]

Hi Jdban101,

Welcome to TI-89.org forums.

Yes, you must type out the list name. The reason is because you can name the lists whatever you want, and there are no built-in "default lists" like the TI-83. On the TI-83, variables like A, Str1, etc. represented a specific type of variable. In other words, you couldn't store a string in A, and you couldn't store a matrix in Y1. However, on the TI-89, any variable name can be of any type, so list1 could be a list today, a matrix tomorrow, and a program name next week. There are no defaults because the TI-89 is intended to have few restrictions on what can be stored in a particular variable.

If you have things that you type a lot and don't want to have to retype them, you can make a custom menu that has the variable names so all you have to do is, say, press [F1] to get "list1" written where your cursor is. However, the amount of work it takes to make a custom menu is probably not worth it in the end--it doesn't really take that long to write "list1" once you get the hang of it.

I don't know of any way to get the TI-89 to show the steps. There might be a program somewhere that does something like that, but I'm not aware of one. If you need steps so that you can understand an integral, talk to someone who knows Calculus, like "Ask Dr. Math". Or just perform some Google searches on how to integrate.

Hope this helps.

~ mellamokb