Random error (cont)
A concrete example helps to explain the concept of random sampling error. A relatively recent study (Schilling, Watkins and Watkins 2002) suggested that the underlying distribution of the height of adult American males was normally distributed with a mean of approximately 176 cm and a standard deviation of 7.4 cm. Assuming that this is correct, the distribution of heights of adult American males would be described by the curve below:
In the example relating to heights of American adult males, how could one reduce the random sampling error in the investigation?
The easiest way would be to increase the number of American adult males selected for measurement.