Stem and Leaf Display

• Stem and Leaf displays are an “in between” a table and a graph– They contain two columns:– The left column contains the first digit in the number – The right column contains the remaining digits

• This provides an estimation of the frequency of each score and the distribution of the scores

Bar Graphs

• Bar graphs list the scores or intervals on the X-axis and the frequency of cases on the Y-axis

Histogram

• Histograms are used for continuous variables – This is shown by the bars being connected

Frequency Curve and Line Graphs

• Frequency Curves are formed by connecting the midpoints of all points of a histogram

Features of a Curve

• Normal Curve – a symmetrical, bell shaped curve

Skewed And Bimodal Curves

• Skewness – a distribution that is asymmetric – Negative Skew – long tail to the left – Positive Skew – long tail to the right

Bimodal Curves

• Bimodal – a distribution with two peaks