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An electrician wants to know whether batteries made by two manufacturers have 2 significantly different voltages. The voltage of 137 batteries from each manufacturer were measured. The population standard deviations of the voltage for each manufacturer 3 are known. The results are summarized in the following table. Manufacturer Sample mean Population standard voltage (millivolts) deviation (millivolts) A 132 4 B 131 2 What type of hypothesis test should be performed? |Select What is the test statistic? Ex: 0.12 Does sufficient evidence exist to support the claim that the voltage of the batteries made by the two manufacturers is different at the a = 0.1 significance level? Select v