14. There is a very large bucket of marbles on a table. The bucket is so large t

Question

14. There is a very large bucket of marbles on a table. The bucket is so large that two or three marbles drawn at random are independent of each other, 30% of the marbles are blue. Suppose I pick two marbles at random from the bucket What is the probability that both marbles are blue? A) 0.60 B) 60% C) 21% D) 9% 15. Florida has played a key role in early 2000's presidential elections. Voter registration records show that 41% of Florida voters are registered as Democrats and 37% as Republicans. Most of the others did not choose a party. To testa random digit dialing device, you use it to call 250 randomly chosen residential telephones in Florida. [If the device works well, your sample will have about 41% registered Democrats and about 37% registered Republicans. If it does not, you need to check your device l Of the registered voters contacted in the sample, 33% are registered Democrats. Is each of the boldface numbers a parameter or a statistic? A) All three: 41%, 37%, and 33%, are statistics. B) 41%, and 37% are parameters and 33% is a statistic. C) 41% and 33% are statistics, 37% is a parameter D) All three: 41%, 37%, and 33%, are parameters.

Explanation / Answer

14).

Binomial probability used.

p=0.3

n=2

P( x=2) =0.09   or 9%

Answer: D) 9%

15).

Answer B).

41% and 37% are parameters and 33% is a statistic

16).

Answer A)

The distribution of sample mean is approximately Normal

17).

Answer C)

Approximately normal with mean 25 and SD=2.21

Sd=7/sqrt(10) =2.21

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