Identify the parameter. For each of the following situations, state whether the parameter of interest is a meanor proportion. It may be helpful to examine whether individual responses are numerical or categorical.

(a)In a study, the baby weights of 100 newborns are observed

(b)In a study, a hospital administrator has collected a random sample of 64 patients and observed(b)the waiting times (in minutes) when they checked into ER until they were first seen by a doctor.

(c)In a survey, nine employees were asked about the family dental expenses in the preceding year.

(d)In a survey, each week Macy's Department Store selects a sample of customers in order to learn about the amount spent per shopping trip.