Question

although samples are usually representative of the population from which they are selected you should not expect a sample statistic to be exactly equal to the corresponding population parameter. the natural difference that exist between statistic and theirparameters are known as

Answer 1

Recall that statistics are numerical values calculated over a set of data points, that are normal a smaller subset of a bigger dataset. The whole dataset is considered as the population, and the subset receives the name of the sample. This fact could be pictured as follows

The parameters, are numerical values that are calculated over the entire population, and in a way, they describe the population in different ways. One example could be the average height of males in the age range 10-15 (parameter), while a statistic woulde be the average of height of males in the age range 10-15 in the city of Washington D.C (sample).

Note that the parameters are normally unkno