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 Robust summaries and relative spread

Practice, difficulty 2 of 3

Is the CV meaningful?

Not started

Decide whether the coefficient of variation is a meaningful summary for each variable.

Monthly salaries of employees (SAR)
Daily temperature in °C
Daily percentage returns of a fund (mean close to 0)
Time to complete an assembly task (minutes)
Exam scores standardised to have mean 0
Weights of parcels in a depot (kg)