If you're going to learn anything in statistics learn this:

My ISDS statistics professor explained this one over and over but somehow it just didn't make sense until a tutor told me the following:

If you're going to learn anything in statistics learn this:

if  p-value < alpha         --> reject the null
that's the rule 100% of the time

The null is just that (NULL - NOTHING- NO CHANGE!)  H0:  MEAN = 0  <-- the null never changes! if there's a change ..then your answer is H1 = which is only saying that its not there's not enough evidence to be H0 (the null)

alpha is usually .05 (can be less tho)
p-value is a proportion!  (This is all assuming normal distribution)

repeat it over and over people ~_~; it can save you many headaches

• also in any F-test you don't care about the left side of the curve..because it starts at 0! that means if you get a negative answer ..you're doing it wrong!