Mathematics, 27.03.2021 05:50 IBillRandomz2958
The lifetime for a certain brand of widgets is normally distributed. A random sample of 25 widgets is taken and a sample mean lifetime of 520 hours with a standard deviation of 50 hours. Before taking the sample, researchers claimed that the mean lifetime of a widget was more than 500 hours. 1. null hypothesis:
2. the alternative hypothesis:
3. explain what test will be used and why?
Answers: 1
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The lifetime for a certain brand of widgets is normally distributed. A random sample of 25 widgets i...
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