A state study on labor reported that one-third of full-time teachers in the state also worked part-time at another job. For those teachers, the average number of hours worked per week at the part-time job was 13. After an increase in state teacher salaries, a random sample of 400 teachers who worked part-time at another job was selected. The average number of hours worked per week at the part-time job for the teachers in the sample was 12.5 with a standard deviation of 6.5 hours. Is there convincing statistical evidence, at the level of α=0.05, that the average number of hours worked per week at part-time jobs decreased after the salary increase? a.
Only 60 is identified as an outlier.

b.
Only 60 and 84 are identified as outliers.
c.
The three values are all identified as outliers.

d.
None of the three values is identified as an outlier.

e.
Only 60 and 62 are identified as outliers.

the answer is A show work.