Suppose that you are interested in determining the average height of a person in a large city. You begin by collecting the heights of a random sample of 100 people from the city. The average height of your sample is 64 inches, while the standard deviation of the heights in your sample is 5 inches.

The standard error of your estimate of the average height in the city is either 0.05, 50, 0.5, 0.0005