Question: Please help with this problem: Batteries are supposed to last for 13 hours with a standard deviation of 0.31 hours.The quality control engineer is testing

Please help with this problem:

Batteries are supposed to last for 13 hours with a standard deviation of 0.31 hours.The quality control engineer is testing a new operating system and finds that a sample of 43 devices using the new operating system exhausts the batteries in a mean of 12.89 hours.Test to determine if the average life of the batteries when using the new operating system is significantly less than the stated life of 13 hours using a = 0.05.

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