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1.
Which theorem or law is correct for supporting the notion that as sample size increases the distribution of the
sample mean
approaches
a normal distribution?
A) The Law of Large Numbers only
B) The Central Limit Theorem only
C) Both The Law of Large Numbers and The Central Limit Theorem
2.
Statistic is to sample as parameter is to
A) population.
B) sample size.
C) mean.
D) estimate.
3.
Suppose that a polling organization surveys n = 400 people about whether they think the federal government should give financial aid to
the airlines to help them avoid bankruptcy. In the poll, 300 people say that the government should provide aid to the airlines. Which
choice gives the correct notation and value for the sample proportion, ρhat, in this survey?
A) ρhat = 0.30
B) ρ = 0.30
C) ρhat = 0.75
D) ρ =0.75
4.
Which one of the following statements is
false
?
A) The standard error measures the variability of a population parameter.
B) The standard error of a sample statistic measures, roughly, the average difference between the values of the statistic and the
population parameter.
C) Assuming a fixed value of s = sample standard deviation, the standard error of the mean decreases as the sample size increases.
D) The standard error of a sample proportion decreases as the sample size increases.
5.
If the sample size (n) is large, and the sample is a random sample, then the distribution of the sample proportion ρhat is approximately a
A) binomial distribution.
B) uniform distribution.
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 Fall '08
 BARROSO,JOAOR
 Statistics

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