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The quality-control manager at Nike Light Bulb (NLB) factory needs to determine whether the mean life of a large shipment of CFLs is greater than

The quality-control manager at Nike Light Bulb (NLB) factory needs to determine whether the mean life of a large shipment of CFLs is greater than 7492 hours. The population standard deviation is 980 hours. A random sample of 49 light bulbs indicates a sample mean life of 7692 hours. Test the claim that the population mean life is not greater than 7492 hours at the 10% of level of significance. What is your statistical decision?

a) Reject the null hypothesis

b) Accept the null hypothesis

c) Accept the alternative hypothesis

d) Do not reject the null hypothesis

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