# Many companies that manufacture lightbulbs advertise their 60-watt bulbs as having an average burn time of 1000 hours. A cynical consumer...

**tshlto**

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.

- 12 years ago
- 5

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