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The mean voltage and standard deviation of 20 batteries from each manufacturer were 2 measured. The results are summarized in the following table. 3 Manufacturer Sample mean Population standard voltage (millivolts) deviation(millivolts) A 142 B 139 What type of hypothesis test should be performed? Select What is the test statistic? Ex: 0.123 What is the number of degrees of freedom? Ex: 25 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