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 81 business students over a one-week period.Assume the population standard deviation is 1.8 hours.With a .95 probability, the margin of error is approximately
A) .39.
B) 1.96.
C) .20.
D) 1.64.

Question

Quizplus · Accepted Answer

The margin of error is calculated using the formula: Z * (σ/√n), where Z is the Z-score for a 95% confidence level (1.96), σ is the population standard deviation (1.8), and n is the sample size (81). The calculation is 1.96 * (1.8/√81) = 0.39.

In Order to Estimate the Average Time Spent Per Student