(16) 2. dr. susan benner 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 scope above 80 indicates stress at a dangerous level. a random sample of 15 executives revealed the following stress level scores. stress level scores 94 78 83 90 78 99 97 90 97 90 93 94 100 75 84 (a) what is value of the population mean? (b) what is the value of the sample estimate? (c) develop a 99 percent confidence interval for the population mean. (d) what is the margin of error? (e) interpret the confidence interval in part c. (f) is it reasonable to conclude that internet executives have a mean stress level in the dangerous level, according to the results of dr. benner's study?