question in economics.

45. Dr. Susan Benner is an Industrial psychologist. She is currently studying stress among ex- ecutives of internet companies. She has developed a questionnaire that she believes mea- sures 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 999790 97 90 93 94 100 75 84 mean? a. Find the mean stress level for this sample. What is the point estimate of the b. Construct a 95 percent confidence level for the population mean. c. Is it reasonable to conclude that Internet executives have a mean stressler gerous level, according to Dr. Benner's test