The​ quality-control manager at a compact fluorescent light bulb​ (CFL) factory needs to determine whether the mean life of a large shipment of CFLs is equal to 7,534 hours. The population standard deviation is 92 hours. A random sample of 64 light bulbs indicates a sample mean life of 7,511 hours.   What is the test​ statistic?   ZSTAT=________

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