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What is the alternative and null hypothesis?

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What is the alternative hypothesis for a null hypothesis stating that the average time a person keeps a cell phone is, at most, three years?

State the null and alternative hypotheses for the following: You are investigating a complaint that "special delivery mail takes too much time" to be delivered.

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Solution Summary

Both the null and alternative hypothesis is described in this solution, along with a brief example.

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Alternative hypothesis is the opposite to the null hypothesis. In this case, the alternative hypothesis is the average time a person keeps a cell phone is more than three years.

Null ...

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