Describe whether the following study would most likely be “observational” or “experimental”, and why it would be so.

*   Researchers test two different blood pressure medicines to determine effectiveness.

&Assume that you have selected 10 students enrolled at your college and have collected data for these three variables:

X: number of  courses enrolled

Y: total cost of text books and supplies for courses

Z: method of payment used for textbooks and supplies

a.What is the population?

b.What is the sample?

c.Classify the three variables as nominal, ordinal, discrete or continuous.

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