The accompanying data table lists measured voltage amounts s

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 those home voltage amounts, test the claim that the mean is 120 volts. Use a 0.01 significance level.

What are the null and alternative hypotheses?

Solution

Set Up Hypothesis
Null, it has a target power supply of 120 volts H0: U=120
Alternate, it doess n\'t has a target power supply of 120 volts H1: U!=120

Rejection Region
Critical Value, Reject Ho, if Z < - 2.58 OR Z > 2.58