After reading this chapter, you should be able to:
1 State two reasons why it is important to summarize data.
2 Define descriptive statistics and explain how they are used to describe data.
3 Identify and construct tables and graphs for frequency distributions.
4 Identify and appropriately use the mean, median, and mode to describe data.
5 Identify and appropriately use the variance and standard deviation to describe data.
6 Define and apply the empirical rule.
7 Identify and construct graphs used to display group means and correlations.
8 Use Cronbach’s alpha and Cohen’s kappa to estimate reliability.
9 Compute the mean, median, mode, variance, and standard deviation using SPSS.
10 Compute two measures of reliability using SPSS: Cronbach’s alpha and Cohen’s kappa.