I'd use regression on your two variables.
Based on your statement 'to see if MC affects engagement'
I would like to see if there is a positive slope when fitting the data.
I'd use 'MC' as X and 'engagement' as Y.
Testing to see if the slope is positive is the same as testing to see if there is a positive correlation.
And we can use all kinds of models too, but I would start with .
I would just obtain the p-values of your tests and I might test for normality before I run those t tests.
I don't think I'm a wizard, I never even played dungeons and dragons as a child.