1. Based on the scale of measurement for each variable listed below, which measure of central tendency is most appropriate for describing the data?
a. The time (in years) it takes a sample of students to graduate college.
b. The blood type (such as A, B, AB, or O) of a group of participants.
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c. The rankings of college undergraduate academic programs.
2. How do the sample mean and the population mean differ? What is the symbol for each type of mean?