1. Last year, the U.S. mean hourly rate was $12.45. In April of this year, a sample of 50 workers showed an average hourly rate of $13.76 with a standard deviation of $3.01. Use a = .05. Would you conclude that hourly rates this year are higher than last year rates? Choose the appropriate hypothesis:
a) Ho: Mu ≤ $13.76 Ha: Mu > $13.76
b) Ho: Mu > $12.45 Ha: Mu ≤ $12.45
c) Ho: Mu ≤ $12.45 Ha: Mu > $12.45
d) Ho: Mu > $13.76 Ha: Mu ≤ $13.76