question archive 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 7,549 hours
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 7,549 hours
Subject:StatisticsPrice: Bought3
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 7,549 hours. The population standard deviation is 700 hours. A random sample of 49 light bulbs indicates a sample mean life of 7,399 hours.
a)At the 0.05 level of? significance, is there evidence that the mean life is different from 7,549 hours?
b) Compute the? p-value and interpret its meaning.
c) Construct a 95?% confidence interval estimate of the population mean life of the light bulbs.
d) Compare the results of? (a) and? (c). What conclusions do you? reach?
