a. distribution of Y_i values must be normally distributed.

b. distribution of epsilon_i values must be normally distributed.

c. distribution of X_i values must be normally distributed.

d. the variance sigma squared must be constant.

e. the epsilon_i error must be independent or at least uncorrelated.

ok, so i've narrowed it down to b and e, but i can't remember/figure out what epsilon is...any help would be much appreciated.