Explain the meaning of
a. Least squares.
b. OLS estimators.
c. The variance of an estimator.
d. Standard error of an estimator.
e. Homoscedasticity.
f. Heteroscedasticity.
g. Autocorrelation.
h. Total sum of squares TSS..
i. Explained sum of squares ESS.,
j. Residual sum of squares RSS..
k. r2
l. Standard error of estimate.
m. BLUE.
n. Test of significance.
o. t test.
p. One-tailed test.
q. Two-tailed test.
r. Statistically significant.