Question
In: Statistics and Probability
26. The quality-control manager at a compact fluorescent light bulb (CFL) factory needs to determine whether...
26. 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 7500 hours. The population standard deviation is 1260 hours. A random sample of 81 light bulbs indicates a sample mean life of 7276 hours.
a. At the 0.05 level of significance, is there evidence that the mean life is different from 7500 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?
e. Compare the results of parts (a) through (d) to those when the standard deviation is 900 hours.
Solutions
orchestra answered 2 years agoRelated Solutions
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b. Compute...
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