r/TI_Calculators
Help implementing LinRegT interval on the TI-83 Plus
I need help coding the LinRegT-interval feature for my Statistic unit and finals. For context, my dumbass decide to save 40 bucks by buying a TI-83 Plus instead of a TI-84 statistic calculator. Because of this, there are many feature that I have to manually code into the program such as GOF test, T interval, and INV Chi. We are currently on the Regression lessons and was recently introduce the regression T-Interval procedure.
I used AI to code the exact code show in the images into the New Program button. After inputing the number in the two list, I run the program, inputted the list and was met with the err:Undefined. When I clicked on GOTO, it ended up on the *, next to the “a”. Can someone check if all the variables are defined, everything is correctly added and I am not missing anything.
If you need more information in order to help me, feel free to ask. (My grammar is buns 💔）
u/billybobsquigglebutt — 7 hours ago
Una más para la colección: TI-84 Evo, lo último de Texas Instruments
u/Duberly1986 — 4 days ago
Really old stuff - 52-Notes
I html-ised the lot, and they're now available with a complete index, and all back-links in articles are clickable. Enjoy!
u/prinoxy — 12 hours ago
▲ 30 r/TI_Calculators
Got this gem for $30
Came with the cable and the slide cover! Perfect working battery, too.
u/doricopter — 2 days ago
Cemetech Contest 27: Dungeon Master
This year, I have created a new contest for Cemetech with some very special prizes!
- TI-84 Evo (Lavendar)
- TI-84 Plus CE Python (Totally Teal, downgraded)
- TI-84 Evo Emulator (4 year subscription, $80 value)
The theme for this contest will be based off a dungeon crawler and entries will be submitted with "Hybrid-BASIC" programs!
If you are interested in participating, head on over to Cemetech for more details!
The contest will end June 11th, 2026 at 12:00 AM UTC and the winners will be revealed two weeks later.
You must have an account on Cemetech.net to participate in CC27.
u/naga_serpentis — 3 days ago
▲ 23 r/TI_Calculators
Amazing Graphing Calculator.
No complaints! (So far after ~1 year)
u/Ate_sandwich — 2 days ago
▲ 3 r/TI_Calculators
TI-84 Plus CE won't show up in TI Connect CE
I tried to plug it in the first time, nothing popped up. I uninstalled the app, rebooted, installed it again, rebooted, then I got that notification about the driver policy. I tried to manually uninstall the device and install it again with the driver path from the support page and nothing again. I have an exam tmrw guys please 😭😭😭
u/ToughAd2699 — 3 days ago
▲ 12 r/TI_Calculators
Calculator was thrown down from a third floor. Any saving it or should I js buy a new one?
u/mo_oms — 4 days ago
▲ 15 r/TI_Calculators
What type of usb is this on ti nspire cx II (not the mini usb, the one to the right of it)
what usb is this to the right of the mini usb on top of the ti nspire cx II? ive been looking everywhere cant find anything. circled in red
u/TheNoobyPro123 — 4 days ago
▲ 2 r/TI_Calculators
Does anyone know if this is possible? if so, how?
u/Thick_Concentrate101 — 7 days ago
u/lurningladybug — 13 days ago
I have been considering the Ti-nspire for a long time. A buddy of mine gave me his Ti-84 Plus CE to mod. Now i'm stuck. I dont know if I want the Ti-nspire or the Ti-84 plus Ce. For context. I am in middle school, but i want a calculator that i can both mod and use for a long time. The games and mods on the Ti-84 seem nice, but the Ti-nspire seems to have more options and solve equations faster. The Ti-nspire has a keyboard built in, and so does the Ti-84, but its harder to use. After reading some posts, i noticed that people are extremely critical about a built in trackpad on the ti-nspire, and how hard it is to use. i dunno, what do you all think. *written by his father
u/No_Huckleberry3361 — 8 days ago
▲ 1 r/TI_Calculators
Ti 84 plus CE calculator not showing up in Ti connect ce software
Im trying to get my calculator out of test mode and its not showing up in the software. I really need help like now sighh.
u/LogMuted2896 — 3 days ago
I found a battery replacement option for the Ti-84+ CE and TI-nspire CX CAS II calculators It's the battery from several Dumb-phones or from Samsung Galaxy Pocket Neo I had no problems using it, except that it doesn't charge. This could be due to a battery failure (it's swollen), or because the calculators don't detect the battery's authenticity verification. If anyone else can perform the tests, please post your results here.
u/Particular_Age4296 — 7 days ago
Sorry if this is a dumb question, but is there a way to trade my calculator color? Or possibly by just the frame and unscrew it and then switch colors? I know this is a first world problem 😭😭
u/AstronomerWest8649 — 7 days ago
▲ 3 r/TI_Calculators
Cant Update my Voyage 200... or do anything at all.
My Voyage 200 Calculator is stuck on the Installation in Progress Please do not interrupt screen. I cant do anything, most of the Button shortcuts dont work. What does work is holding Apps while turning on the calculator to make it ready for an OS install. I can connect my calculator to TI Connect flawlessly while in this state, but when i want to load the newest OS onto the Calculator, the Screen sais "Cannot Back up cert memory" and TI Connect sais something in French (Le transferit courant a echoue. Une prochaine tentative peut reussir (8C010001)). I alrealy replaced the normal Batteries and the Memory-Battery with brand new ones... what is left to do?
u/RBX_A — 5 days ago
I need to do this simple calculation for electrical engineering, and no matter the mode i cannot get this to work. I keep getting the same error. If anyone has any idea please let me know.
u/Leather-Basket4919 — 10 days ago