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You collect the test scores of every other student in a class. Is this data set a population or sample?

A report shows the amount (in dollars) spent by each customer in a grocery store. Is this data set a population or sample?

46.5% of all registered voters in a country are registered democrats. Is this a parameter or a statistic?

A survey of 40 gym members from a large gym finds an average work out duration is 52 minutes. Is this a parameter or a statistic?