The mean voltage and standard deviation of 8 batteries from each manufacturer were measured. The results are summarized in the following table.   Manufacturer Sample mean voltage (millivolts) Population standard deviation(millivolts) A 149 3 B 143 5     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?______   What is the number of degrees of freedom?______   Does sufficient evidence exist to support the claim that the voltage of the batteries made by the two manufacturers is different at the α=0.05 significance level?______ select (no or yes)

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