Z scores are the number of standard deviations a score or a value (x) away from the mean and are a measure of the dispersion of data.
A Chi-Square goodness of fit test tells how well a categorical (nominal or ordinal) sample distribution fit into a hypothetical distribution.
Dispersion is the degree of variation in the data. In other words, the extent of the spread of values from the mean.
Box plots are graphical tools that let you easily visually compare variation between the data sets evaluated.
A Histogram is a bar chart showing the frequency of an outcome. They can reflect the voice of the process & will certainly be on your exam.