I have a TI-89 and use the "Stats/List Editor" to calculate power regression. My numbers are as follows (X , Y):
10 169 15 120 20 94 25 78 30 67 35 58
When doing power regression calculation (F4->3:Regressions ->9:PowerReg), I get the following result: a = 1237,83 b = .-876608
My classmates gets totally different numbers. This isn't first time it has occurred, so it really bugs my.
They get the following: a = 1195,86 b = -0,849047
I've also tried entering the numbers on a few websites and it gives me the same numbers as my classmates.
My classmates also use TI-89, altough mine is newer than theirs.
Any ideas on what can cause this?