Widening the confidence interval from 95% to 99% increases the ______ but decreases the ______.
A)precision;reliability
B)precision;confidence
C)confidence;precision
D)accuracy;precision

Question

Quizplus · Accepted Answer

Widening the confidence interval from 95% to 99% increases the confidence that the true population parameter falls within the interval, but this comes at the cost of decreased precision (i.e. larger margin of error). Therefore, the correct answer is C, as it correctly identifies the increase in confidence and decrease in precision. The other answer choices are incorrect as they either mislabel the concepts being affected or suggest a decrease in reliability or accuracy, which are not affected by the widening of the confidence interval.

Widening the Confidence Interval from 95% to 99% Increases the ______