The accompanying data table lists measured voltage amounts supplied directly to a family’s home. The power supply company states that it has a target power supply of 120 volts. Using these home voltage amounts, test the claim that the mean is 120 volts. Use a 0.05 significance level.
Calculate the test statistic.
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No one can help if you don't provide all the relevant info.
Ugh, this isn't an incredibly user-friendly format... Anyway, the first thing to do is compute the mean of the sample, so take the average of the "Volts" data (see the pic below).
We'll use a \(Z\) test to compare this sample mean to the predicted mean.
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If you're at all familiar with the standard normal distribution, the conclusion should be obvious, but if you're not, consult a table of \(z\) scores, like the one linked here:
Notice that our calculated \(Z\) is not even listed.