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Name: April 24, 2001 Score:

MATH 147

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Quiz 11

(8 pts.)

Problem 1. A simple random sample of 100 m&m's is taken from a large vat. The sample contains 40 brown, 17 green, 30 yellow, and 13 red m&m's. Find a 90% confidence interval for the percentage of yellow m&m's.

(2 pts.)

Problem 2. Assuming you constructed the confidence interval in problem 1 correctly, what is the probability that the confidence interval contains the true percentage of yellow m&m's in the vat?

a. 90%

b. 1.65

c. 100%

d. None of the above.