I have found a significant interaction with two continuous variables. I proceeded to create simple slopes graphs as recommended by Preacher (i.e., - 1 SD, mean, and +1SD slopes). What exactly to these different lines mean? I understand the mean - but what do the -1 SD and +1SD slopes represent - have we created three different groups (low group, medium group, and high group)? Is the +1SD line representing an individual? Would like any clearing up on this! Thanks.
I understand the interpretation of an interaction etc. Just want some intuition on how to explain the graph (simple slopes) to someone who keeps thinking I took the data set and divided it into tertiles.