Unit 1A - Exploring One-Variable Data 
        1.1 Introducing Statistics: What Can We Learn from Data?
        1.2 Variables
        1.3 Tabular Representation and Summary Statistics for One Categorical Variable
        1.4 Graphical Representations for One Categorical Variable 
         Mid Unit1A Review
        1.5 Graphical Representations for One Quantitative Variable
        1.6 Descriptions for One Quantitative Variable Distributions
        1.7A Summary Statistics for One Quantitative Variable
        1.7B Summary Statistics for One Quantitative Variable
        1.8 Graphical Representations of Summary Statistics for One  Quantitative Variable
        1.9 Comparisons of the Distributions for One Quantitative Variable
         Unit 1A Review