If numerous large random samples or repetitions of the same size are taken from a population, the frequency curve made from proportions from the various samples will have a mean that is __________ the true population proportion.
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Q. 2If numerous large random samples or repetitions of the same size are taken from a population, the frequency curve made from proportions from the various samples will have an approximate __________ shape.
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Q. 3If numerous large random samples or repetitions of the same size are taken from a population, the proportions from the various samples will have what approximate mean?
a. The true population proportion.
b. The true population average.
c. 95 because most of them will be within 2 standard deviations of the true population value.
d. None of the above.
Q. 4If numerous large random samples or repetitions of the same size are taken from a population, the frequency curve made from proportions from the various samples will have what approximate shape?
a. A bar graph with two bars, one for the proportion having the trait of interest, and the other for the proportion not having the trait of interest.
b. A bell-shape.
c. A flat shape; each outcome should be equally likely.
d. Unknown; it can change every time.
Q. 5In which of the following situations does the rule for sample proportions apply?
a. A pollster takes a random sample of 1,000 Americans and asks their opinion on the President (approve/disapprove/neutral). He is interested in the percentage who approve of the President.
b. You want to know whether or not people like the new CD by your favorite artist. You ask 5 people and record the percentage who say they like it.
c. A researcher weighs the same newborn baby each week for one year, and records whether or not the child is within the normal weight range. At the end of the year, he records the percentage of times that the child was within the normal weight range.
d. All of the above.
Q. 6In practice you don't know the population value, and you take a sample in order to estimate what the population value is. Once you take a specific sample, is it possible to determine whether or not that sample is an accurate reflection of the population? Explain your answer.
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