In a civil trial, the test for drawing an inference is whether the inference is more probable than not on the balance of probabilities. It is an error to direct a jury that an inference must be 'the only inference reasonably open' or that a conclusion must 'necessarily follow' from accepted facts — those formulations reflect the criminal standard and are not applicable to civil proceedings. Jury directions on inferences must make clear that the balance of probabilities applies to both underlying facts and the inferences drawn from them.
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