Question

A random sample of 85 group leaders, supervisors, and similar personnel at General Motors revealed that, on average, they spent 6.5 years in a particular job before being promoted. The standard deviation of the sample was 1.7 years.

Construct a 95% confidence interval. (Round your answers to 2 decimal places.)

Answer 1

The 95% confidence interval is between 6.14 and 6.86

Explanation:

See attached picture for solution