SOLUTION: Dr. Susan Breuner is an industrial psychologist. She is studying stress among executives amount internet companies. She has developed a questionnaire that she believes measures str
Question 670666: Dr. Susan Breuner is an industrial psychologist. She is studying stress among executives amount internet companies. She has developed a questionnaire that she believes measures stress. A score of 80 indicates stress at a dangerous level. A random sample of 15 executives revealed the following stress level scores:
90 78 83 90 78 99 97 90 97 90 93 94 100 75 84
a) Find the sample mean and sample standard deviation.
b) Construct a 95% confidence interval for the population mean.
c) Can you conclude that internet executives have a mean stress level in the dangerous level and why?
Please show all work, calculations, and formulas! Thank you! Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!
Hi,
A score of 80 indicates stress at a dangerous level
90 78 83 90 78 99 97 90 97 90 93 94 100 75 84 , ,
95% confidence level. Degree of freedom = 14,
ME =
89.2 - ME < < 89.2 + ME = 4.46, z = 4.46, Yes, dangerous