Populations and Samples

1st lesson of Stats Textbook - most important to remember the terms.

Population

Whole set of items that are of interest

Census

observes or measures every member of a population

Sample

Selection of observations from a group in a population used to find out information about the population altogether

Ads of a census?

should give a completely accurate result

Disads of a census?

time consuming and expensive

Cannot be used when testing process destroys items

Hard to process large quantities of data

what impact does the size of a sample make on validity of conclusions?

Generally, the larger the sample, the more accurate it is but you need more resources.

What

What tends to be inevitable when coming to a conclusion from samples?

Different samples lead to different conclusions because of natural variations in a population

Sampling units

Individual units of a population

Sampling frame

Numbered or individually named to form it.