stem and leaf display stem and leaf displays are an “in between” a table and a graph – they...
Post on 18-Dec-2015
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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
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