Question

1. The average length of all the trout in a river is 60 cm. This data summary represents a ____________________(parameter/statistic).
2. If the Hamilton High School freshman class is the sample in a statistical study, then which is not a possible for the study?

A. The student body of Hamilton High School

B. The students in Hamilton High School's district

C. The students in Ms. Anderson's science class

D. All freshman students in the state

Answer 1

Answers:

1. Parameter
2. C. The students in Ms. Anderson's science class

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Explanation for problem 1

If all we're concerned with are the trout in this river, and this river only, then we are measuring the parameter population mean value of 60 cm. Parameters always go with populations; while statistics go with samples.

A quick way to remember:

• parameter and population both start with p
• statistic and sample both start with s

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Explanation for problem 2

This question seems to be missing a key word. The portion that reads "then which is not a possible for the study?" seems to have a missing word where the blank is shown below

then which is not a possible _____ for the study?

I think "population" should be put into the blank. If that's the case, then choices A, B, and D are all possible populations here. They are larger than the sample of freshmen at this high school. Notice how the students in Ms. Anderson's class is a smaller set compared to the set of all freshmen at Hamilton High School. The sample must always be smaller than the population, or phrased another way, the population must always be larger than the sample.

So this is why choice C is the answer.