The completion time for a production process is believed to be normally distributed with a mean ofp = 31 minutes and a standard deviation of J = 2.8 minutes. A recently appointed production team introduced new efficiencies that they claim make the completion of the process faster. To test this claim, a random sample of n = 12 production shifts were taken and the observed mean completion time was 1? = 27.8 minutes. a. In testing the production team's claim, select the appropriate alternative hypothesis, H1 or Ha: o,u273 Op727.8 op>31 ou