(d) 12 marks

i) Provide an approximate interpretation of 3.

ii) Provide an exact interpretation of $3.

iii) Is 3 practically significant? Briefly explain.

iv) What is the predicted average birth weight of a male child, born to a white mother, who

smokes 20 cigarettes per day and who has a family income of $50,000?

v) Derive a 95% confidence interval for B3.

vi) Comment on the precision of 33 as an estimate of ß3.

(2 marks)

(2 marks)

(2 marks)

(2 marks)

(2 marks)

(2 marks)