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Name: April 12, 2001 Score:

MATH 147

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Quiz 9

(6 pts.)

Problem 1. For a fair die tossed 144 times,

a. approximate the probability of getting exactly 12 aces. (The side with one dot)

b. About what are the chances of getting between 7 and 17 aces, excluding the endpoints?

(2 pts.)

Problem 2. In the statistical sense, a parameter is

a. a numerical fact about a population.

b. the amount of bias induced by non-respondents in a survey.

c. the average of a sample.

d. controlled for by using a random sample.

e. choices a c and d.

(2 pts.)

Problem 3. Small samples are

a. more prone to bias that a large sample.

b. likely to have a larger chance error.

c. better than large sample when the large sample is a simple random sample.

d. better than large samples when the large sample is biased and the small sample is a simple random sample.

e. both a and b.