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 2 of 3

Classify the weakness

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Classify the main weakness of each claim.

“After our leadership course, 80% of participants were promoted within three years.”
“A survey of our newsletter subscribers shows 85% of residents back the new mall.”
“Children who eat breakfast do better at school, so free breakfasts will raise grades.”
“The new filter doubles the detection of fraud,” where detection rose from 0.02% to 0.04% of transactions.
“Patients in our clinic recovered in an average of 9 days after starting our therapy.”
“Hospital visitors were asked at the exit how satisfied they were with public health services.”