10_normal_curve_angel

10_normal_curve_angel - Shapes and Distributions Review...

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Shapes and Distributions
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Review Recall that we discussed sampling earlier Population : the universe of all individuals of interest Sample : a group drawn from the population to represent the population We are talking today about shapes data can take on for populations
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We also previously discussed histograms Note that we could take a smooth curve along the top of a histogram to represent the data This is called a frequency curve
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Creating a Frequency Curve                       Frequency Curve                       
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Shapes of Different Distributions Is the distribution symmetrical or skewed? Unimodal or bimodal? Any outliers? Legislative voting on abortion laws? Amount in parking tickets charged to students in Com 200? Heights of females in Com 200?
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0 0.0005 0.001 0.0015 0.002 0.0025 0.003 0.0035 0.004 0.0045 200 300 400 500 600 700 800 SAT Scores Height of Curve Normal Frequency Curve for SAT Scores
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The normal curve Normal curve : a distribution whose frequency curve is bell shaped Many distributions follow this curve: pulse rate, IQ, male height, female height, overall ideology of the population NOT legislative voting on abortion, amount in parking tickets
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Normal Curve If data from a population is normal , we can easily estimate the proportion of people within any given interval on the curve E.g. “Half the population has an IQ of less than
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10_normal_curve_angel - Shapes and Distributions Review...

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