The Human Relations Director at DuPont began a study of the overtime hours in the Inspection Department. A sample of 16 workers showed they worked the following number of overtime hours last month:
12 10 15 8 7 4 5 9
8 12 11 9 6 2 12 3
a) Compute the arithmetic mean and discuss what the answer in the context of the problem.
b) Compute the standard deviation and discuss what the answers means in the context of the problem
c) Are the values calculated in part (a) and (b) statistics or parameters? Explain why.