The sample variance for a repeated-measures t-test is done on a sample of difference scores. With that in mind, what is the formula for this ( s² )?
a) ( s² = ∑(x - barx)²/n - 1 )
b) ( s² = ∑(x - barx)²/n )
c) ( s² = ∑(x - barx)²/n + 1 )
d) ( s² = ∑(x - barx)²/n - 2 )
