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 standard deviation 6.5 hours. Is there convincing statistical evidence, at the level of 0.05, that the average number of hours worked per week at part-time jobs decreased after the salary increase? a. No. The p-value of the appropriate test is greater than 0.05.
b. No. The p-value of the appropriate test is less than 0.05.
c. Yes. The p-value of the appropriate test is greater than 0.05.
d. Yes. The p-value of the appropriate test is less than 0.05.
e. Not enough information is given to determine whether there is convincing statistical evidence