STATS 10 Lecture Notes - Lecture 3: Income Distribution, Bar Chart, Unimodality

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9 Apr 2017
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Stats 10 lecture notes week 1 day 3. Dot plot: start with number line & put dor for each observation. Ex. family with 5 kids ages: 1,1,2,4,15. Dot plots provide sense of where data is located and how spread out it might be. Can work well with larger data sets as well. Read about stem plots in the textbook. Shapes of distributions when talking about a numeric variable, we talk about the distribution of data. Underlying histogram are many observations of numeric variables. Unimodal: 1 location most common, 1 peak of distribution. Symmetric: extremes and tails are equally frequent. Very few high values like 100 million no values below 0. Pretend we have gathered categorical data of cars n the parking structure. Low variation--most values in sample are similar to each other. High variation--most values are different from each other.

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