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Interpretation, difficulty 3 of 3

A rise in mean satisfaction

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A bank's branch network reports that mean customer satisfaction on a 1–5 scale (1 = very dissatisfied, 5 = very satisfied) rose from 3.4 to 3.6 after a service programme, and calls this “a 6% improvement in satisfaction”. In two or three sentences, explain what is questionable about this report and what you would show instead.