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StatKey Online Tools for Teaching a Modern Introductory Statistics Course Robin Lock Burry Professor of Statistics St. Lawrence University

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Presentation on theme: "StatKey Online Tools for Teaching a Modern Introductory Statistics Course Robin Lock Burry Professor of Statistics St. Lawrence University"— Presentation transcript:

1 StatKey Online Tools for Teaching a Modern Introductory Statistics Course Robin Lock Burry Professor of Statistics St. Lawrence University rlock@stlawu.edu CAUSE Webinar- August 27, 2013

2 What is it? Freely available at lock5stat.com/statkey Runs in (almost) any browser. Also available as a Google Chrome App. A set of web-based, interactive, dynamic statistics tools designed for teaching simulation-based methods such as bootstrap intervals and randomization tests at an introductory level. StatKey

3 Who Developed StatKey? The Lock 5 author team to support a new text: Statistics: Unlocking the Power of Data Robin & Patti St. Lawrence Dennis Iowa State Eric UNC/Duke Kari Harvard/Duke Wiley (2013)

4 Programming Team Rich Sharp Stanford Ed Harcourt St. Lawrence Kevin Angstadt St. Lawrence StatKey is programmed in JavaScript StatKey

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6 Examples 1. Mean price of a used Mustang (Bootstrap CI for a mean) 2.Does drinking beer attract mosquitoes? (Randomization test to compare means) 3. Pulse rate: Athlete vs. non-athlete (Enter own data) 4. Sandwich ants (ANOVA for means)

7 What is the average price of a used Mustang car? Select a random sample of n=25 Mustangs from a website (autotrader.com) and record the price (in $1,000’s) for each car. Key concept: How much can we expect the sample means to vary just by random chance?

8 lock5stat.com/statkey StatKey

9 We are 95% sure that the mean price for Mustangs is between $12,068 and $20,126

10 Beer and Mosquitoes Does consuming beer attract mosquitoes? Experiment: 25 volunteers drank a liter of beer, 18 volunteers drank a liter of water Randomly assigned! Mosquitoes were caught in traps as they approached the volunteers. 1 1 Lefvre, T., et. al., “Beer Consumption Increases Human Attractiveness to Malaria Mosquitoes, ” PLoS ONE, 2010; 5(3): e9546. Beer mean = 23.6 Water mean = 19.22 H 0 : μ B =μ W H 0 : μ B >μ W

11 lock5stat.com/statkey StatKey

12 p-value = proportion of samples, when H 0 is true, that are as (or more) extreme as the original sample. p-value

13 Example: Pulse Rate by Athlete Status Is the mean pulse rate higher for non-athletes? Find a 95% CI for the difference in mean pulse rate between athletes and non-athletes

14 lock5stat.com/statkey StatKey Data are in a spreadsheet  Copy/paste into StatKey (Edit Data)

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16 Example: Sandwich Ants Experiment: Place pieces of sandwich on the ground, count how many ants are attracted. Does it depend on filing? Favourite Experiments: An Addendum to What is the Use of Experiments Conducted by Statistics Students? Margaret Mackisack http://www.amstat.org/publications/jse/v2n1/mackisack.supp.html

17 lock5stat.com/statkey StatKey

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19 lock5stat.com/statkey StatKey

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21 lock5stat.com/statkey StatKey Give it a try! Questions? rlock@stlawu.edu

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