Statistics Quest

Practice

Practise until it sticks

Choose a topic, a skill or a difficulty. Calculation exercises have new versions with fresh numbers once you have solved them, so you can practise the method rather than memorise an answer.

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Practice, difficulty 3 of 3

Sound or unsound interpretation?

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Classify each statement as a sound interpretation or a misinterpretation.

“The difference was not statistically significant, so the two training methods are equally effective.”
“If we repeated this survey many times, about 95% of the intervals built this way would contain the true proportion.”
“The result is highly significant, so the effect must be large.”
“A larger random sample would give a narrower margin of error.”
“Our sample of 50,000 website visitors has a margin of error of ±0.4 points, so the estimate is free of bias.”
“The new process cut average handling time by 6 seconds; the difference is statistically significant but too small to justify retraining costs.”