Use the following information for questions:
A manufacturer of cell phones is interested in evaluating two alternative existing layout and flow path designs. Design 1 is the current one in use and Design 2 is a new proposed plan. Both designs were implemented for eight consecutive working days and the output of each design was recorded.
-How would a 90% confidence interval for the mean difference in output compare to the 95% confidence interval?
A) It would be wider.
B) It would be narrower.
C) It would stay the same.
D) You cannot tell until you look up the multiplier value.

Question

Use the following information for questions:
 A manufacturer of cell phones is interested in evaluating two alternative existing layout and flow path designs. Design 1 is the current one in use and Design 2 is a new proposed plan. Both designs were implemented for eight consecutive working days and the output of each design was recorded.
-How would a 90% confidence interval for the mean difference in output compare to the 95% confidence interval?
A) It would be wider.
B) It would be narrower.
C) It would stay the same.
D) You cannot tell until you look up the multiplier value.

Quizplus · Accepted Answer

A 90% confidence interval would be narrower than a 95% confidence interval because it encompasses a smaller area under the normal distribution curve, indicating less confidence in the estimate and thus a smaller range.

Use the Following Information for Questions