Question #41939
A random sample of 10units of mobile phone batteries from manufacturer A gave a lifetime with standard deviation of 5 months while a random sample of 13 units of batteries from manufacturer B gave a lifetime with standard deviation of 4 months. Assume the population to be approximately normal with equal variances. Use a 0.10 level of significance.
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2014-05-02T07:14:39-0400
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