StatKey Online Tools for Teaching a Modern Introductory Statistics Course Robin Lock St. Lawrence University USCOTS Breakout – May 2013 Patti Frazer Lock.

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Presentation transcript:

StatKey Online Tools for Teaching a Modern Introductory Statistics Course Robin Lock St. Lawrence University USCOTS Breakout – May 2013 Patti Frazer Lock St. Lawrence University Kari Lock Morgan Duke University Eric F. Lock Duke University Dennis F. Lock Iowa State University lab machines; Use Student Metadata0 (Wireless) Username: san PW: 25565

What is it? 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 Freely available at No login required Runs in (almost) any browser (incl. smartphones) Google Chrome App available (no internet needed) Standalone or supplement to existing technology

Who Developed StatKey? The Lock 5 author team to support a new text: Statistics: Unlocking the Power of Data Wiley (2013) Rich Sharp Stanford Ed Harcourt St. Lawrence Kevin Angstadt St. Lawrence Programming Team:

WHY? Address concerns about accessibility of simulation-based methods at the intro level Design an easy-to-use set of learning tools Provide a no-cost technology option Support our new textbook, while also being usable with other texts or on its own StatKey

Example: 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 $1,000s) for each car.

Sample of Mustangs: Our best estimate for the average price of used Mustangs is $15,980, but how accurate is that estimate?

Bootstrapping Assume the population is many, many copies of the original sample. Key idea: To see how a statistic behaves, we take many samples with replacement from the original sample using the same n. Let your data be your guide.

Original Sample Bootstrap Sample

Original Sample Bootstrap Sample Bootstrap Statistic Sample Statistic Bootstrap Statistic Bootstrap Distribution

Bootstrap CI via SE

Bootstrap CI via Percentiles Keep 95% in middle Chop 2.5% in each tail We are 95% sure that the mean price for Mustangs is between $11,930 and $20,238

Your Turn 2. Find a 98% confidence interval for the slope of a regression line to predict Mustang price based on mileage.

Example: Do people who drink diet cola excrete more calcium than people who drink water? 16 participants were randomly assigned to drink either diet cola or water, and their urine was collected and amount of calcium was measured.

Diet cola (mg)Water (mg) Original Sample Does drinking diet cola really leach calcium, or is the difference just due to random chance?

Diet colaWater Original Sample Simulated Sample (random chance if the null hypothesis is true) Diet colaWater

p-value Proportion as extreme as observed statistic observed statistic Distribution of Statistic Assuming Null is True

Your Turn 1. In the British game show Golden Balls are older or younger participants more generous (more likely to split)? 2. Is there a positive association between malevolence of NFL uniforms and the number of penalty yards a team gets?

Example: Average enrollment in statistics graduate programs We will look at sampling distributions for mean graduate student enrollment in statistics graduate programs.

Sampling Distribution Capture Rate

Theoretical Distributions Easier than tables!

Pause for Questions ??????

Your Turn 1. Explore on your own the options under Descriptive Statistics and Graphs. 2. Do ants have a preference for different types of sandwiches? (Randomization ANOVA) 3. Does temperature make a difference in hatching python eggs? (Randomization test for a two-way table)