The average life of an android phone in the Philippines is 30 months. It is known that the standard deviation of the said phone is 4 A test is conducted to validate whether the claim is true. 100 units are randomly chosen to be tested and were found that the mean life is 34 months. Test the hypothesis using a level of significance of 5%.   Answer the ff: Ho: (answer in sentence and in formula) Ha: (answer in sentence and in formula) Test-statistics appropriate for it:

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