If a manager wishes to develop a confidence interval estimate for estimating the difference between two population means, an increase in confidence level will result in:
A) a decrease in the size of the critical value.
B) a wider confidence interval.
C) a need for an increased sample size.
D) all of the above.

Question

Quizplus · Accepted Answer

Increasing the confidence level results in a wider confidence interval because a higher confidence level means capturing a broader range of values to ensure the true difference between the two population means falls within the interval. This does not necessarily decrease the size of the critical value or require an increased sample size directly, although a wider interval might suggest a desire for more precision, which could lead to considering a larger sample.

If a Manager Wishes to Develop a Confidence Interval Estimate