Samples are drawn at random with replacement, so every visit gives slightly different histograms. Changing the shape, n or p clears the samples, because the sampling distribution changes.
Sketch first, then compute. The worked solution builds line by line after a correct answer or when you ask for it.
Your jobQuick-fire questions on standard errors, z for x̄, which picture matches a sample size, and the np ≥ 10 check. Answer as many as you can in 60 seconds. Three right in a row earns double points. Keys 1 2 3 pick an answer.
Press Start to begin.
Fictional settings and practice numbers chosen to look realistic. They are not clinical reference values or advice.
Wrong picks are fine here. Each one tells you why.