Samples of size 2,500 will produce estimates of the population value that are __________ times more accurate than samples of size 25 . (Assume the population is bell-shaped. Use standard deviation as a measure of accuracy.)
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Q. 2Larger samples tend to result in __________ accurate estimates of population values than do smaller samples.
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Q. 3If 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.
Q. 4In 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.
Q. 5Which of the following are examples where you would be interested in estimating the population mean?
a. About how long do left-handed people live?
b. Do most people support or oppose the President's foreign policy?
c. What size was the viewing population who tuned in to the ABC News special last night?
d. All of the above.
Q. 6The standard deviation of the proportions from numerous random samples of size 1,000 from a population will be __________ the standard deviation of the proportions from numerous random samples of size 10,000 from the same population.
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