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.

← Back to the list · from Where data come from

Practice, difficulty 2 of 3

Reliable, valid, both or neither

Not started

A company measures “employee productivity” as the number of minutes each employee's computer is active per day. Activity is recorded precisely and consistently by software. Which description fits best?

Choose one