The wait time at a drive-through fast-food restaurant has a standard deviation of 18.0 seconds. Use the following data, which has come from a population that is normally distributed, to decide whether...

 The wait time at a drive-through fast-food restaurant has a standard deviation of 18.0 seconds. Use the following data, which has come from a population that is normally distributed, to decide whether the evidence suggests the standard deviation of wait time is less than 18.0 seconds, using an α=0.05 level of significance.

108.5, 80.4, 67.4, 95.5, 58.0, 86.5, 75.9, 70.9, 65.1, 72.0

2C) Calculate the appropriate Test Statistic.
2D) Find the appropriate Critical Value.
2E) Use your work in parts C & D to support and state your conclusion.