# Means and Confidence Levels

Dr. Walker is an industrial psychologist. She is currently studying stress among executives of Internet companies. She has developed a questionnaire that she believes measures stress. A score above 80 indicates stress at a dangerous level. A random sample of 15 executives revealed the following stress level scores.

94 78 83 90 78 99 97 90 97 90 93 94 100 75 84

a. Find the mean stress level for this sample. What does the point estimate of the population mean?

b. Construct a 95 percent confidence level for the population mean.

c. Is it reasonable to conclude that Internet executives have a mean stress level in the dangerous

level, according to Dr. Benner's test?

https://brainmass.com/statistics/confidence-interval/means-confidence-levels-57706

#### Solution Preview

Dr. Walker is an industrial psychologist. She is currently studying stress among executives of Internet companies. She has developed a questionnaire that she believes measures stress. A score above 80 indicates stress at a dangerous level. A random ...

#### Solution Summary

This includes calculations of a mean, point estimate of the population mean and confidence level.