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 7,500 hours. The population standard deviation is 1,000 hours. A random sample of 64 CFLs indicates a sample mean life of 7,250 hours. Suppose the p-value for the evidence is 0.09. Your decision on the test using a 0.15 level of significance should be to

a) reject the null hypothesis

b) not reject the null hypothesis

c) accept the null hypothesis

d) reject the alternative hypothesis