Of a random sample of 900 trucks at a bridge, 360 had bad signal lights. Construct...
Of a random sample of 900 trucks at a bridge, 360 had bad signal lights. Construct a 99 percent confidence interval for the percentage of trucks that had bad signal lights.
Homework Answers
Given:
n = 900 trucks, X = 360 had bad signal lights
Find: 99% Confidence interval
= 1 - Confidence
level = 1 - 0.99 = 0.01
Calculation:
Critical value:
Z/2 = Z
0.01/2 = 2.58
99% Confidence interval:
(0.36, 0.44)
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