A 95% confidence interval estimate for a population mean $\mu$ is determined to be 43.78 to 52.19. If the confidence level is decreased to 90%, the confidence interval$\mu$:
A)becomes wider.
B)remains the same.
C)becomes narrower.
D)None of these choices are correct.

Question

Quizplus · Accepted Answer

When the confidence level is decreased, the confidence interval becomes narrower because there is less certainty required about the estimate, thus requiring a smaller range to capture the population mean.

A 95% Confidence Interval Estimate for a Population Mean μ\muμ Is Determined to Be 43

A 95% Confidence Interval Estimate for a Population Mean $\mu$ Is Determined to Be 43