After reading this chapter, you should be able to:

1. Distinguish between a population mean and sample mean.
2. Calculate and interpret the mean, the median, and the mode.
3. Calculate and interpret the weighted mean for two or more samples with unequal sample sizes.
4. Identify the characteristics of the mean.
5. Identify an appropriate measure of central tendency for different distributions and scales of measurement.
6. Compute the mean, the median, and the mode using SPSS.