Please please help, how do I test different gradients for a regression model?

LGB

New Member
#1
I have been given data and asked to obtain the line of best fit (the regression equation) which i found was y=49.587-0.642*x.

The second task is to test the claim by some guy that y would fall by 0.5 for each unit increase in x. I have to determine if the claim is supported by the data and linear model.

Please help because I am stumped how to test this? Some of my class mates suggested using a t test?