researchers are interested in finding out if police officers and firefighters differ with regard to stress on the job. two samples include 127 firefighters, 197 police officers. police officers = mean anxiety on the job was 12.8, with standard deviation of 2.76. Firefighters mean is 8.8, standard deviation of 2.85. Assume a .05 level of significance to test null hypothesis.

a. what type of stat test should be used?

b. what is null hypothesis?

c. what is calculated t statistic, show work

d. what are the degrees of freedom?

e. state conclusion of results in simple terms.