# Statistics for Criminology and Criminal Justice

Third Edition

# Learning Objectives

- Explain the difference between measures of dispersion and measures of central tendency.
- Explain why measures of dispersion must be reported in addition to measures of central tendency.
- Define kurtosis, leptokurtosis, and platykurtosis.
- Explain and know the relevant formulas for variation ratio, range, variance, and standard deviation.
- Apply the correct measure(s) of dispersion to any given variable based on that variable’s level of measurement.
- Explain the normal curve and the concept behind two-thirds of cases being within one standard deviation of the mean.
- Calculate the upper and lower boundaries of the typical range of scores in a normal distribution based on the mean and the standard deviation.