An electrician wants to know whether batteries made by two manufacturers have significantly different voltages. The voltage of 128 batteries from each manufacturer were measured. The population standard deviations of the voltage for each manufacturer are known. The results are summarized in the following table. Manufacturer Sample mean voltage (millivolts) Population standard deviat 112 5 B 111 3 What type of hypothesis test should be performed? (Select What ie the tect ctatictio Ev: 0 12

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A: The mean is 17.8 and the standard deviation is 2.9.

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