An electrical firm manufactures light bulbs that have a lifetime that is approximately normally distributed with a
Question:
An electrical firm manufactures light bulbs that have a lifetime that is approximately normally distributed with a mean of 800 hours and a standard deviation of 40 hours. Test the hypothesis that p = 800 hours against the alternative p ≠ 800 hours if a random sample of 30 bulbs has an average life of 788 hours. Use a P-value in your answers.
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The hypotheses are Ho 800 H 800 ...View the full answer
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Related Book For 
Probability & Statistics For Engineers & Scientists
ISBN: 9780130415295
7th Edition
Authors: Ronald E. Walpole, Raymond H. Myers, Sharon L. Myers, Keying
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