In order to estimate the average time spent per student on the computer terminals at a local university, data were collected for a sample of 64 business students over a one-week period. Assume the population standard deviation is 1.6 hours. If the sample mean is 9 hours, then the 95% confidence interval is _____ hours.
A) 7.04 to 10.96
B) 7.36 to 10.64
C) 7.80 to 10.20
D) 8.608 to 9.392

Question

Quizplus · Accepted Answer

The 95% confidence interval is calculated using the formula: sample mean ± (Z * (population standard deviation / sqrt(sample size))). With a Z value of 1.96 for 95% confidence, the interval is 9 ± (1.96 * (1.6 / 8)), which simplifies to 8.608 to 9.392.

In Order to Estimate the Average Time Spent Per Student