Part 2: Hypothesis Testing for mu when sigma² is known Question 5: Two-tail test (15 points) A manufacturer claims that the output for a certain electric circuit is 130V. A sample of n=9 independent circuits is selected and the output voltages are measured. The sample mean is found to be 128V with a sample standard deviation of 2V. Test the manufacturer's claim at a 5
1) The null hypothesis is mu = 130V
2) The null hypothesis is mu > 130V
3) The null hypothesis is mu < 130V
4) The null hypothesis is mu ≠ 130V