A hospital ER wants to determine if patients are waiting in the waiting room longer than 30 minutes. A random sample of 100 people was gathered. The mean waiting room time was 25 minutes with a...

A hospital ER wants to determine if patients are waiting in the waiting room longer than 30 minutes. A random sample of 100 people was gathered. The mean waiting room time was 25 minutes with a standard deviation of  5.5 minutes. Is the value significantly greater than 15? Use a 5% level of significance.  Give Ho and Ha. The appropriate test. Decision rule. Test calculations. Conclusion compared to alpha or critical value.