I am currently working on my masters thesis and I am testing for mediation. For this mediation I am using the Baron and Kenny method. For path c, you need to see if the effect of the X variable (packaging material) on the Y variable (purchase intention) is significant WITHOUT the variable M (ease of use of a packagin). When I take M out of the regression, my X variable becomes insignificant. I know that complete mediation means that an effect of the X variable 'disappears' when you add the mediator M. Now in this example it actually appears when I add my mediator.
Is this still an example of mediation?
PS: I used the Sobel test to doublecheck and it says there is mediation. I just can't seem to understand why this is mediation and how I should write it down in my thesis.