Review and Unit Quiz

In this unit, you should have learned:

• A population is a group that represents every individual member.
• A sample is a subset of a population and for statistical reasons, should be selected randomly to ensure the most accurate representation of the population.
• The mean is the average of a set of data.
• The median is the middle value of the data set.
• The mode is the data value that occurs most often in your set of data.
• Frequency Tables help us locate the mode and calculate percentage values.
• Relative Frequency Histograms can be created from our frequency tables and are a good method to visually represent our data. When creating the histogram, we should be careful to select equal classes, or ranges of data values, that are appropriate for our data.