Sampling Error Numerical Calculation

Consider 5 farmers with incomes: 500, 550, 600, 650, 700. A sample of 2 farmers with incomes 500 and 600 is selected. What is the sampling error?

Pilot Survey Definition

A try-out of the questionnaire with a small group before the actual survey is conducted is known as:

Judgment-Based Sampling Type

When an investigator selects samples from a population based on his own judgment or convenience, it is called: