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lecture3

# lecture3 - Why are graphs important Number of O-rings...

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Why are Why are graphs graphs important? important?

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Number of O-rings damaged Temp on Jan 28, 1986

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Why Graph? Summarize complex data visually Analyze trends in data Communicate results to others Learning and problem solving
Types of Data Categorical: mutually exclusive groups

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Types of Data Continuous: infinitely divisible into smaller parts (just add decimal places)
Types of Data Discrete: continuum with certain values (usually whole)

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Essential Parts of a Graph
Types of Graphs Bar graphs Best for discrete and categorical data for independent variable Histograms are special bar graphs, which plot a frequency distribution

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Types of Graphs Pie charts Categorical or discrete data Percentages or proportions Student movie preference
Types of Graphs Scatter plots Best for continuous data for independent variable Reveals relationships between data, called a correlation

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Correlation Temperature (˚C) Time (days) 0 10 10 30 Treatment Control 5
Correlation Time (days) 0 10 30 Treatment Control Trend line Temperature (˚C) 10 5

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lecture3 - Why are graphs important Number of O-rings...

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