For each data set:
(a) Find the mean.
(b) Find the standard deviation, treating the data as a sample.
(c) Find the standard deviation, treating the data as a population.
(d) What does this exercise show about the two formulas?
Data Set A: 6, 7, 8
Data Set B: 4, 5, 6, 7, 8, 9, 10
Data Set C: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13