Productivity metricA firm measures productivity in a call center by calls handled per hour. Management notices an increase in this metric and concludes that customer service quality has improved.Which statement, if true, most seriously weakens this conclusion?

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Productivity metric<br>A firm measures productivity in a call center by calls handled per hour. Management notices an increase in this metric and concludes that customer service quality has improved.<br>Which statement, if true, most seriously weakens this conclusion?