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The meantime between failures (in hours) for a company used is 420. after 15 new things were...

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Themeantime between failures (in hours) for a company used is 420.after 15 new things were modified an attempt to improvereliability, tests we're conducted to measure the times betweenfailures. the mean time for 15 new things is 442.2 and the standarddeviation is 44. test the claim at the modified radios have a meangreater than 420 using a significance level of 0.025.

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Ho 420 Ha 420 Right tail test Level of Significance 003 sample std dev s 440000 Sample    See Answer
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