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A phone manufacturer wants to compete in the touch screen phone market. Management understands that the leading product has a less than desirable battery life.
They aim to compete with a new touch phone that is guaranteed to have a battery life more than two hours longer than the leading product.
A recent sample of 120 units of the leading product provides a mean battery life of 5 hours and 40 minutes with a standard deviation of 30 minutes.
A similar analysis of 100 units of the new product results in the mean battery life of 8 hours and 5 minutes and a standard deviation of 55 minutes. It is not reasonable to assume that the population variances of the two products are equal.
a. Set up the hypotheses to test if the new product has a battery life more than two hours longer than the leading product.
b. Implement the test at the 5% significance level using the critical value approach.
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