Asked by Nishat
A manufacturer claims that the mean lifetime of its lithium batteries is 1400 hours. A homeowner thinks it may be different from 1400 hours. He randomly selects 40 of these batteries and finds the mean lifetime to be 1370 hours with a standard deviation of 80 hours. Test the manufacturer’s claim at the 0.05 significance level.
Answers
Answered by
PsyDAG
Z = (score-mean)/SD
Z = (1370-1400)/80 = ?
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability related to the Z score.
Z = (1370-1400)/80 = ?
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability related to the Z score.
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