For each of the following statements, explain whether you think the variables will have positive correlation, negative correlation, or no correlation. Support your opinion.
(a) Number of cigarettes smoked by a pregnant woman each week and birth weight of her baby
(b) Years of education and annual salary
(c) Number of doctors on staff at a hospital and number of administrators on staff
(d) Head circumference and IQ
(e) Number of movie goers and movie ticket price