Which of the following are assumptions required to test hypotheses using simple linear regression? (a) The random variable Y is normally distributed. (b) The variance of Y depends only upon X. (c) The...

Which of the following are assumptions required to test hypotheses using simple

linear regression?

(a) The random variable
Y
is normally distributed.

(b) The variance of
Y
depends only upon
X.

(c) The random variable
Y
is normally distributed for each value of
X.

(d) The mean of
Y
is a linear function of
X.