You are a new manager at al lowbucks coffee shop. Your workers are already complaining! They want you to hire more help. They claim that they are having to make at least 200 cups of coffee an hour. You doubt that, so you take a sample over a few hours and find that over a four hour period one Friday afternoon, the workers averaged 191 cups of coffee per hour, with a standard deviation of 6 cups. Using a significance level of 0.05, perform a hypothesis test to see if the workers are right, and you need to hire more help. Write your hypotheses, calculate your test statistic and decide whether or not to reject your null.