Statistics

Definitions A statistical study targets a set of people, objects or events called a population. More specifically, studies deal with characteristics: Quantitative or Qualitative variables. A sample is a subset of a population. The size of a sample is the number of elements it contains.’ A sample is representative when it has the same characteristics as the population.

MAIN TYPES OF STATISTICAL STUDIES. Census : A census is a statistical study in which the entire population (every member) is analysed using different variables. It is a measuring instrument for which the degree of certainty is high, but it requires on a tremendous amount of resources  human, material and financial.

MAIN TYPES OF STATISTICAL STUDIES. Poll: A poll is a statistical study in which a sample of a population is analysed so that conclusions can be drawn concerning the whole population. Despite a degree of uncertainty, a well-conducted poll offers a sufficiently accurate picture of the situation. It is used when the target population is too dense or inaccessible.

MAIN TYPES OF STATISTICAL STUDIES. Study: A more complete statistical study usually involving experts and various data-gathering methods is called a study. The latter is used when polls or censuses are insufficient or inadequate.

Collection Methods  a written questionnaire, that a person fills out and returns to the poll  a telephone interview,in which the pollster asks questions on the telephone  a face-to-face interview, often takes place in public  direct observation, in which the pollster, using an observation grid, records events or the behaviour of people documentary observation, in which the data are collected to create a database the use of mechanical or electronics devices and instruments