The mean voltage and standard deviation of 13 batteries from each manufacturer were measured. The results are summarized in the following table.   Manufacturer Sample mean voltage (millivolts) Population standard deviation(millivolts) A 131 4 B 128 1     What type of hypothesis test should be performed? ________ select (left-tailed z-test, paired t-test, two-tailed z-test, unpaired t-test)     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 α=0.1 significance level?______ select ( no or yes)

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