Histograms Bins are the bars Counts are the heights Relative Frequency Histograms have percents on vertical axis.

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Presentation transcript:

Histograms Bins are the bars Counts are the heights Relative Frequency Histograms have percents on vertical axis

Stem-Leaf Plot Contain same information as a histogram but also preserve individual data valves.

Dot Plots Places a dot along an axis for each case in the data. Great for small data sets.

Time Plots Dots arranged in data order. Lines connect the dots.

Describing Histograms Center (mean or median) Unusual features (outliers and/or gaps) Shape (Normal? Skewed? Modes?) Spread (range, IQR or SD)

Approximately Normal Distribution

Histogram: Skewed to the right

Skewed to the Left

Skewed to the ?

Bimodal

Outlier with a gap

Outliers