Construct a 95% confidence interval estimate of the population mean life of light bulbs in this shipment if a random sample of 50 light bulbs selected from the shipment indicates a sample mean life of 350 hours.
Explain the main claims or ideas that the documentary is trying to prove. In other words, what is the documentary trying to show about its subject matter?
August 5, 2017Explain the famous person s personality development from one theoretical orientation like ego-psychology, behavioral, etc.
August 5, 2017Construct a 95% confidence interval estimate of the population mean life of light bulbs in this shipment if a random sample of 50 light bulbs selected from the shipment indicates a sample mean life of 350 hours.
The quality control manager at a light bulb factory
needs to estimate the mean life of a shipment of 2,000 light
bulbs. Assume that the standard deviation is 100 hours and
that sampling is done without replacement.
a. Construct a 95% confidence interval estimate of the population
mean life of light bulbs in this shipment if a random
sample of 50 light bulbs selected from the shipment
indicates a sample mean life of 350 hours.
b. Determine the sample size needed to estimate the population
mean life to within hours with 95% confidence.
c. What are your answers to (a) and (b) if the shipment contains
1,000 light bulbs?
