What do I use

Education

Achievement studies, teaching interventions, curriculum evaluation, assessment research.

The usual order: Define the outcome - account for the school or class - compare or predict - check the test itself.

Your question, and what answers it

Or ANOVA for more than two methods, with the effect size a head teacher can act on.

In ZStat: open your study, go to Analysis, and choose independent t.

What goes wrong in education

Analysing at the student level a treatment that was assigned to whole classes.
Reporting a significant improvement without the effect size, when a two-mark gain on a hundred-mark paper is not an educational finding.

ZStat runs these checks whether or not you ask, and stops the analysis when one of them would make the result misleading. You do not have to remember this list.

Other fields

Medicine and clinical research Public health and epidemiology Psychology and behavioural science Agriculture and food science Urban planning, estate management and architecture Economics, finance and accounting Engineering, manufacturing and quality Sociology, development and social work

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