Many companies that manufacture lightbulbs advertise their 60-watt bulbs as having an average burn t
Many companies that manufacture lightbulbs advertise their 60-watt bulbs as having an average burn time of 1000 hours. A cynical consumer bought 30 bulbs and burned them until they failed. He found that they burned for an average of M = 1233, with a standard deviation of s = 232.06. Perform all six steps of hypothesis testing to determine whether the burn time of lightbulbs differs from that claimed by companies manufacturing them.
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