Suppose we want to estimate the average number of purchases in a given hour in a local convenience store. Using this example, describe in your own words how you would go about determining this average through:

Question

Suppose we want to estimate the average number of purchases in a given hour in a local convenience store.  Using this example, describe in your own words how you would go about determining this average through:
a.    Drawing a random sample
b.    Drawing a systematic sample
c.     Drawing a convenience sample

PsyDAG · Answer

You would want to control for the days of the week and times of purchases, so I would pick B.