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

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?

Is this the question you were looking for? If so, place your order here to get started!