# Design of Experiments

• ### Webinar: Using Data from the Federal Statistical System to Inspire Students

Statistics educators are keenly aware of the value of using real data to help students see the relevance and applicability of statistics. The federal statistical agencies have invested in significant efforts to make data accessible and available. In this webinar, Ron Wasserstein will point you to these resources, discussing their uses and limitations.
• ### Quote: Machol on Coincidences

Most accidents in well-designed systems involve two or more events of low probability occurring in the worst possible combination. is a quote by American systems engineering expert Robert E. Machol (1917 - 1998). The quote is found in his 1975 column "Principles of Operations Research" for the journal "Interfaces" vol. 5, pages 53-54 (this column was titled "The Titanic Coincidence."
• ### Webinar: Over the HILS: Learned Helplessness in Statistical Instruction

Brandon Vaughn from the University of Texas: Some students in statistics classes exhibit behaviors that share characteristics with the established construct of learned helplessness. This webinar will discuss this phenomenon, and detail an instrument recently developed which measures this (HILS: Helplessness in Learning Statistics).
• ### Quote: Holmes on Certainty

Certitude is not the test of certainty. We have been cock-sure of many things that were not so. is a quote of American Supreme Court Justice Oliver Wendell Holmes, Jr. (1841 - 1935). The quote is found in an article written by Justice Holmes in 1918 for the "Harvard Law Review" v. 32, page 40. The quote is also found in the book "Statistically Speaking, a Dictionary of Quotations" by Carl Gaither and Alma Cavazos-Gaither.
• ### Quote: Youngman on Gambling

I bet on a horse at ten-to-one. It didn't come in until half-past five. is a quote by comedian and violinist Henny Youngman (1906 - 1998).
• ### Count This: A Primer for the Study of Statistics

This short article begins with a brief explanation of 3D barcodes (what they are and how they are used), and then provides an argument for why statistics should be studied and how statistics is a part of everyday life. Several links are shared for other resources related to teaching and learning statistics, in addition to a link to a career options in statistics.
• ### Mouse Experiment

This Flash based applet simulates data from a case study of treatments for tumor growth in mice. This simulation allows the user to place mice into a control and treatment groups. The simulation then compares the difference in the groups based on this haphazard selection to those of a truly random assignment (the user may also create multiple random assignments and examine the sampling distribution of key statistics). The applet may be used to illustrate three points about random assignment in experiments: 1) how it helps to eliminate bias when compared with a haphazard assignment process, 2) how it leads to a consistent pattern of results when repeated, and 3) how it makes the question of statistical significance interesting since differences between groups are either from treatment or by the luck of the draw. In this webinar, the activity is demonstrated along with a discussion of goals, context, background materials, class handouts, and assessments. Key Note for Instructors: The data are drawn from a real experiment with an effective treatment but where the response is correlated with animal age and size (so tumor size will tend to be smaller in the treatment group when measured at the end of a randomized experiment but animal age and size should not be). Typically people choosing haphazardly will tend to pick larger/older animals for the treatment group and thus create a bias against the treatment.
• ### Song: It Had to be Mu

Song celebrates advantages of the mean (over the mode and median) and includes conceptual references such as BLUE and MAD. May be sung to the tune of "It Had To Be You" (Gus Hahn and Isham Jones). Musical accompaniment realization and vocals are by Joshua Lintz from University of Texas at El Paso.