Need help implementing LinRegTInt on the TI-83 Plus [Q]
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” at line 8. Can someone check if all the variables are defined, everything is correctly added and I am not missing anything?
Here is the code:
Name: LINRGINT
:Input "X LIST:",L₁
:Input "Y LIST:",L₂
:Input "CONF LEVEL:",C
:LinReg(ax+b) L₁,L₂
:dim(L₁)→N
:N-2→D
:2-Var Stats L₁,L₂
:√((Σy²-a*Σxy-b*Σy)/D)→S
:(1-C)/2→A
:0→X
:solve(A-tcdf(-1ᴇ99,X,D),X,5,{0,99})→T
:T*S/√(Σx²-(Σx)²/N)→E
:ClrHome
:Disp "LOWER:",a-E
:Disp "UPPER:",a+E
If you need more information in order to help me, feel free to ask. (My grammar is buns 💔）