Question: A study noted that the mean life span for 35 male symphony conductors was 73.4 years, in contrast to the mean of 69.5 years for

A study noted that the mean life span for 35 male symphony conductors was 73.4 years, in contrast to the mean of 69.5 years for males in the general population. The longer life span was attributed to such factors as fulfillment and motivation. There is a fundamental flaw in concluding that male symphony conductors live longer. What is it?

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