Mathematics, 04.02.2020 05:46, zoriahmendoza

Standby time is amount of time a phone can remain powered on while not being used. a cell phone company claims that the standby time of certain phone model is 16 days on average. a consumer report firm gathered a sample of 19 batteries and conducted tests on this claim. the sample mean was 15 days and 10 hours and the sample standard deviation was 30 hours. assume that the standby time is distributed as normal. in testing if the average standby time is shorter than 16 days, compute the value of the test statistic (round off to second decimal place).

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Standby time is amount of time a phone can remain powered on while not being used. a cell phone comp...