# Im stuck at finding the number of degrees of freedom Jump to level 1 The mean...

###### Question:

im stuck at finding the number of degrees of freedom
Jump to level 1 The mean voltage and standard deviation of 17 batteries from each manufacturer were measured. The results are summarized in the following table. 3 Manufacturer Sample mean voltage (millivolts) Sample standard deviatio A 171 2 B 169 3 What type of hypothesis test should be performed? Two-tailed z-test What is the test statistic? 2.550 What is the number of degrees of freedom? Ex: 250 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? No Check Next

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