The mean voltage and standard deviation of 8 batteries from each manufacturer were measured. The results are summarized in the following table. Manufacturer A Sample mean voltage (millivolts): 151 Sample standard deviation (millivolts): 2 Manufacturer B Sample mean voltage (millivolts): 147 Sample standard deviation (millivolts): 3 What type of hypothesis test should b
The mean voltage and standard deviation of 8 batteries from each manufacturer were measured. The results are summarized in the following table.
Manufacturer A
Sample mean voltage (millivolts): 151
Sample standard deviation (millivolts): 2
Manufacturer B
Sample mean voltage (millivolts): 147
Sample standard deviation (millivolts): 3
What type of hypothesis test should be performed?
Unpaired t-test
Two-tailed z-test
Left-tailed z-test
Paired 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 = 0.01 significance level?
Yes
No
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