Guides and printable resources

Understand the method, practise with checked examples, and take a printable worksheet to your next lesson or planning session.

• Sample vs Population Standard Deviation

  Understand when variance divides by n or n − 1, what that choice estimates, and how to interpret standard deviation in the original units.

• Ratios and Statistics Practice Worksheet

  A printable classroom worksheet with ratio word problems, proportion, part-to-whole, variance and standard-deviation practice plus a worked answer key.