Use the Following to Answer Questions

Short Answer

Use the following to answer questions :
The mean job-related stress score for all corporate managers is 8.40 and the mean job-related stress score for all college professors is 5.95.The standard deviations of the job-related stress scores are 0.66 for the corporate managers and 0.82 for the college professors.Suppose we take one sample of 225 corporate managers and another sample of 167 college professors.
-What is the standard deviation of the sampling distribution of the difference between the mean stress scores for corporate managers and college professors,rounded to four decimal places?