Age of Patients. Consider the set of all patients enrolled in your local diabetes centre during the past 30 days. Suppose you are interested in learning about the average age of this group.

a. Define the population and the variable of interest.

b. Is the variable qualitative or quantitative?

c. Suppose you obtain the age of every patient who visited the centre. Would this data represent a census or a sample?

d. Suppose you obtain the age of the first patient visiting the centre on each day for the last 30 days. Would this data represent a census or a sample?

e. If you obtain the ages of all the patients who visited the centre in the last 30 days, how much reliability does your findings have as an “estimate” of the average age?

f. How can you select a random sample of size 30 from the population?