Question 1054414
Ho: There is no change in stress
Ha: There is a change in stress
alpha=0.05 P{reject Ho|Ho true}
two-sided
critical value is |z|>1.96
test statistic z=(x=mean)/sd=(60-85)/15=-25/15=-1.6
This does not meet the critical value.
The z-score for significance has to be greater than a certain value or less than a certain value.  This z-score is not, so the difference is not significance.  
Draw a normal distribution with the sd s marked to 3.
Put a vertical line at +1.96 and -1.96
The man's score is at z=-1.64.