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'Jump to level 1 An electrician wants to know whether batteries made by two manufacturers have signicantly different voltages. The voltage of 134 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 (millivdl'ts) Population standard deviat What type of hypothesis test should be performed _ Righttailed z-test Left-tailed ttest Twotailed t-test What is the test statistic? ;_Ex: 0.12 l Does sufcient evidence exist to support the claim . by the two manufacturers is different at the a = l Two-tailed z-test