I have a dataset where I am comparing two variables, activity is dependent and days_existed is independent. The correlation between the two variables is 0.41 and I ran an OLS linear regression analysis then plotted the results.
R-squared is 0.15 and p-value for dependent variable is 0.000, the intercept coefficient is negative.
What else should I be looking at that could be important in determining is there is a relationship between the two variables?
Here is the plotted regression line, it looks like the model is wrong to me.