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W1 Answers to a One Sample t Test

# W1 Answers to a One Sample t Test - Answers to a One Sample...

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Answers to a One Sample t Test The following will assist you in understanding more the hypothesis process, and prepare you for the Applications 1 activity in Week Two. "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 life of 311 days with a sample standard deviation of 12 days. Did the modification increase the mean life of the battery? ‘ The level of significance for this problem is 0.05. Setup the null hypothesis and alternative hypothesis. Ho: μ 305 H 1 : μ > 305 Note that in a hypothesis set up we are looking for one of three possibilities that the "situation" is asking: is there a difference in the mean, is there an increase from the mean, or is there a decrease from the mean? I have put the key words in bold. In the "last sentence" above, note the key word is increase. Important: when there is a direction (increase/more than or a decrease/less than) that direction is always in the alternative. If there is no

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W1 Answers to a One Sample t Test - Answers to a One Sample...

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