Question (20 Marks)

a)Distinguish between Type I and Type II errors

b)State the advantages of the confidence interval approach over the test of significance approach in hypothesis testing

c) How does regression analysis differ from correlation analysis?

d) State the assumptions underlying the Ordinary Least Squares (OLS) method

e) With the aid of an example in each case , distinguish between a linear regression model and a non-linear regression model

f) State and briefly explain the properties of the OLS estimators