Find the confidence interval.
-A large software development firm recently relocated its facilities. Top management is
Interested in fostering good relations with their new local community and has encouraged
Their professional employees to engage in local service activities. They wish to
Determine the average number of hours the firm's professionals volunteer per month. A
Random sample of 24 professionals yields a mean of 16.6 hours and a standard deviation
Of 2.22 hours. The 95% confidence interval is
A) 14.62 to 15.78 hours.
B) 14.38 to 18.82 hours.
C) 14.95 to 18.25 hours.
D) 15.66 to 17.54 hours.
E) 16.04 to 17.16 hours.

Question

Quizplus · Accepted Answer

The confidence interval is:16.6 +/- 1.96 * (2.22 / sqrt(24))= 16.6 +/- 1.96 * (2.22 / 4.899)= 16.6 +/- 1.96 * 0.453= 16.6 +/- 0.889= (15.66, 17.54)

Find the Confidence Interval