Question: Bright Lite claims that its 60 watt light bulb burns with a
Bright-Lite claims that its 60-watt light bulb burns with a length of life that is approximately normally distributed with a standard deviation of 81 hours. A sample of 101 bulbs had a variance of 8075. Is this sufficient evidence to reject Bright-Lite’s claim in favor of the alternative,“the standard deviation is larger than 81 hours,” at the 0.05 level of significance?
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