If numerous large random samples or repetitions of the same size are taken from a population, the frequency curve made from means from the various samples will have what approximate shape?
a. A flat shape; each outcome should be equally likely.
b. A bell-shape.
c. A histogram.
d. Unknown; it can change every time.
Question 2
In which of the following situations does the rule for sample means not apply?
a. A pollster takes a random sample of 1,000 Americans and asks them to give their opinion of the President on a scale from 1 (completely disapprove) to 100 (completely approve). He is interested in the average rating.
b. You take a random sample of 20 students' scores from the ACT exam and record the average score. Assume ACT scores are bell-shaped.
c. A sports fan takes a random sample of 20 NBA players and records their salaries. He wants to estimate the average salary for the entire NBA.
d. The rule for sample means does not apply in any of these situations.
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