Which of the following are positive and which negative correlations?
(a) The rise of lung cancer with the increase in smoking.
(b) The rise in monthly mortgage payments as interest rates rise.
(c) The decrease in dam levels as rainfall decreases.
(d) The increase in the cost of domestic water as dam levels fall.
(e) The fall in weekly income as overtime hours fall.
(f) Children from larger families tend to have poorer health records than those from smaller families.