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Homework Check. Unit 5 Day 5. HISTOGRAMS. How many paperclips can you hook together in 60 seconds?. Histogram. Frequency Distribution. Histogram. Good way to display information from large data sets Width of bar (x-axis) represents interval Height of bar (y-axis) represents frequency.
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Unit 5 Day 5 HISTOGRAMS
How many paperclips can you hook together in 60 seconds? Histogram Frequency Distribution
Histogram • Good way to display information from large data sets • Width of bar (x-axis) represents interval • Height of bar (y-axis) represents frequency
Histogram • Each interval bin should have the same width • Each bin includes the left endpoint value but not the right endpoint value • Bars always touch
Constructing a histogram: • Determine interval width • 5 to 10 intervals is usually best • Organize data into a frequency table • Distribute data into intervals
Sample Data: How long does the 1161 mile Iditarod take? Construct a bin width of 25.
235 260 285 310 335 360
Distribution Shapes • Symmetrical • Uniform (rectangular histogram) • Skewed left – longer tail on the left side • Skewed right – longer tail on the right side • Bimodal – two classes with the largest frequencies are separated by at least one class