Mathematics, 12.04.2021 06:50, NeverEndingCycle

A quality control engineer is testing the battery life of a new smartphone. The company is advertising that the battery lasts 24 hours on a full-charge, but the engineer suspects that the battery life is actually less than that.
They take a random sample of 50 of these phones to see if their average battery life is significantly less than 24
hours.
Let u represent the mean battery life for this population of phones.

A quality control engineer is testing the battery life of a new smartphone. The company is advertis

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