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Very Old Man

Is the age of this very old man statistically believable?

Chi-squared Faker

How would you massage the data in this Chi-squared test to both accept and reject the hypothesis?

Robin's Hypothesis Testing

How many trials should we do in order to accept or reject our null hypothesis?

Reaction Timer Timer

Age 16 to 18 Challenge Level:

You might need a stopwatch. How might you estimate your reactions in stopping the stopwatch?

Also, there is a very clear and precise explanation for the lengths of time that elapse before the stars appear.