Confidence intervals
4 practice questionsIntroductory StatisticsStep-by-step solutions
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1
A 95% confidence interval for a mean is best interpreted as:
A.95% of the data lie in the interval
B.The interval contains the true mean with 95% confidence
C.The mean equals 95
D.There is a 95% error rate
2
Holding everything else fixed, increasing the confidence level from 95% to 99% makes the interval:
A.Wider
B.Narrower
C.Unchanged
D.Centered at zero
3
A 95% confidence interval for a mean means that:
A.95% of data lie in the interval
B.If sampling were repeated, about 95% of such intervals would contain the true mean
C.The mean is 95
D.The standard deviation is 5%
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