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Outline

Outline. 1. Histograms and boxplots 2. Mean and standard deviation 3 . Proportions and bar charts 4 . Sampling and allocation 5 . Inference and confidence intervals. 6 . t tests and alternatives 7. ANOVA 8. Regression and correlation 9 . More ANOVA and regression

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Outline

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  1. Outline 1. Histograms and boxplots 2. Mean and standard deviation 3. Proportions and bar charts 4. Sampling and allocation 5. Inference and confidence intervals 6. t tests and alternatives 7. ANOVA 8. Regression and correlation 9. More ANOVA and regression 10. Categorical data analysis

  2. Histograms and Boxplots Learning outcomes Statisticalese Making histograms - deciding type and bin width - the macro/micro distinction in graphing Making boxplots - ranking and ordering data - learning the 5-point summary

  3. Statisticalese I will probably have a bagel today. Probability of having a bagel > 50% It takes about 20 minutes to cook rice. The central tendency (more on what this means throughout the course) for cooking rice is 20 minutes. Statisticalese takes English phrases that include numerical information and uncertainity and translates them (often making them more precise).

  4. Today's data set: DNA exonerations • Hundreds of people found guilty of crimes, who spent time in prison, and later exonerated by DNA evidence. • http://www.innocenceproject.org/ • http://www.fiu.edu/~dwright/steps/dnaphotos.pptx

  5. This is what a data file looks like in most statistics packages Focus is on the timei variable for years in prison. The subscripts show the values vary.

  6. Frequency Table

  7. Histogram: With dots 0 10 20 Frequency 0 10 20 30 Years in prison

  8. Stem and leaf diagram

  9. Deciding bin width

  10. Name histogram

  11. 5 point summary values: 2 5 8 3 8 7 2 2 12 sorted: 2 2 2 3 4 7 8 8 12 ranks: 1 2 3 4 5 6 7 8 9

  12. Median when n is even: the mid-rank

  13. Boxplots (Box and Whiskers)

  14. Comparing histograms and boxplots

  15. Summary • Statisticalese. A language for numbers and chance. • Histograms. Decide bin width. • Boxplot. Shows outliers well. • Graphs. Make clear. Avoid adding frills.

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