guessIt

This guessIt app was created by Daniel Simons and Emily Cunningham. The purpose of the app is to help you develop an intuitive understanding of how various statistical measures (e.g., correlation, effect size) are related to actual data. The app generates random sample data and you can guess the relevant statistic. Over time, we hope to add more statistics to the menu options on the left.

For most of the cases, your answers and the correct answers are rounded to 1 decimal place. Given rounding, an estimation error of 0.1 means that your answer was between 0.051 and 0.149 of the correct answer.

Students taking Psych 235 at the University of Illinois can log in using their netID and password (from Canvas) to receive credit for completing assignments.

Login

This log in option is only for students in Psychology 235 at the University of Illinois. After you log in, go to the save results tab and to save your data. To log out, just click Reset App.

Save Results

Only students in Psych235 at the University of Illinois can save their results. After you log in, return to this tab and you will see the option to save your results. After you save results, your data will be cleared and you will be logged out automatically. That will be indicate that your results were saved. You can then log in again to try more of the guessing games.

Guess the Z score

Guess the Standard Deviation

Guess the Correlation

Guess the effect size (d)

Guess the effect size (d) - two groups