1). For the following data x: {8,9,7,4,2}

Find [sigma](use whichever method you want,assume population data):

2). For the following data x: {8,9,7,4,2}

Calculate SS/N = , what name do we give that statistic?

3). The deviation-method formula calculating the standard deviation (and variance) includes the mean. Explain why it makes sense for this measure of the variability of a sample to be calculated using the mean. (Hint: what is it that the standard deviation measures?).

4). For the following set of sample data:x = {3,5,2,2,4,1,5 }, compute:

The standard deviation using both the Deviation Scores Method and Raw Scores Method. Show work.