Discussion:
Q: In 2001, the U.S. Department of Labor reported the average hourly earnings for U.S. production workers to be $14.32 per hour. A sample of 60 production workers during 2003 showed a sample mean of $14.68 per hour. Assuming the population standard deviation σ = $1.55, can we conclude that an increase occurred in the mean hourly earnings since 2001? Use α = .05.
a) In proper notation, state the hypotheses of this test.
b) Show your calculation of the test statistic.
c) Give the p-value of the test to 4 decimals.
d) What is the conclusion about the issue in question