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Erik Wright  committed e1424c5

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 {{{django-lean}}} provides daily reports of experiment results, including confidence levels.
 
 * For conversion experiments, results and confidence are displayed per conversion goal type (and for 'any' goal). Confidence is calculated using the chi-square method.
-* For engagement experiments, confidence is calculated using the z-test method.
+* For engagement experiments, confidence is calculated using the Student's t-test method.
 
 Experiment reports are prepared using the {{{update_experiment_reports}}} management command. It's advisable to execute this command from a nightly cron-job.