A manufacturer receives an order for fluorescent light bulbs. The order requires that the bulbs have a mean life
span of 850 hours. The manufacturer selects a random sample of 25 fluorescent light bulbs and finds that they
have a mean life span of 845 hours with a standard deviation of 15 hours. Test to see if the manufacturer is
making acceptable light bulbs. Use a 95% confidence level. Assume the data are normally distributed.

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The Answer of A manufacturer receives an order for fluorescent light bulbs. The order requires that the bulbs have a mean life
span of 850 hours. The manufacturer selects a random sample of 25 fluorescent light bulbs and finds that they
have a mean life span of 845 hours with a standard deviation of 15 hours. Test to see if the manufacturer is
making acceptable light bulbs. Use a 95% confidence level. Assume the data are normally distributed.

A Manufacturer Receives an Order for Fluorescent Light Bulbs