CEVAP:

There are some assumptions that need to be considered as follows:

The random variable ? is statistically independent from the values of independent variable.
The random variable ? follows a Normal distribution.
The arithmetic mean of the random variable ? is zero.
Two random errors such as ?i and ?j, i?j are independent of each other.
The relationship between the variables is linear.
The variance of the residuals at all levels of independent variable is constant