(b) The mean life of a battery used in a digital clock is 305 days. The lives...
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(b) The mean life of a battery used in a digital clock is 305 days. The lives of the batteries follow the normal distribution. The battery was recently modified to last longer. A sample of 20 of the modified batteries had a mean of 311 days with a standard deviation of 12 days. Did the modification increase the mean life of the battery?
What is your decision regarding! the null hypothesis at 5 percent significance level?
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ISBN: 978-0471697916
1st edition
Authors: Douglas C. Montgomery, Cheryl L. Jennings, Michele E. Pfund
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