Quiz_06

# Quiz_06 - Unit Quiz 06...

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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, ρ-hat, in this survey? A) ρ-hat = 0.30 B) ρ = 0.30 C) ρ-hat = 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 ρ-hat is approximately a A) binomial distribution. B) uniform distribution.

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## This note was uploaded on 10/08/2010 for the course STAT 200 taught by Professor Barroso,joaor during the Fall '08 term at Penn State.

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Quiz_06 - Unit Quiz 06...

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