The quality control manager at a light bulb factory needs to determine

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The quality control manager at a light bulb factory needs to determine whether the mean life of a large shipment of light bulbs is equal to 375 hours. The population standard deviation is 100 hours. A random sample of 64 light bulbs indicates a sample mean life of 350 hours.

 

a. What are the null and alternate hypotheses?

b. Draw a diagram labeling all axes and the rejection & failing to reject regions.

 

c. At the .05 level of significance, what is your conclusion? Why?

 

d. Suppose a Type II error occurs. What might be the consequences of the event and who suffers?