The State Agriculture Department Tested 203 Fuel Samples Across the State

The state agriculture department tested 203 fuel samples across the state in 2009 for accuracy of the reported octane level. For premium grade, 14 out of 105 samples failed. Find a 99 percent confidence interval for the true population proportion of premium grade fuel-quality failures.

A) [.045, .221]
B) [.068, .198]
C) [.023, .115]
D) [.048, .219]
E) [.100, .276]

Correct Answer:

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