Exploring the various definitions in statistics

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Exploring the various definitions in statistics

Mall Surveys Sample Usually we cannot collect data from every member of the population we are interested in. We must find a sample that will accurately represent that population. We use the results of the sample to draw a conclusion about the population Example of using a sample: A chef would taste a spoonful of soup to predict how the whole pot of soup tastes.

What would happen if we just added salt and forgot to stir it?

Exploring the various definitions in statistics

A sample that does not accurately represent the population. Biased samples can give inaccurate results. For example if you wanted to know the percentage of students at your school recycled, a sample of the ecology club would be a biased sample.

A sample that is chosen because it is easy. For example, if you wanted to see find out the percentage of students who ate the school lunch, and you just asked those people at your table if they ate the school lunch. A sample that accurately represents the whole population.

For example if you wanted to get a random sample of all the students in your school, you could put all of their names in a bin and randomly draw out however many you wanted in your sample. A sample that is chosen systematically. For example if you surveyed every tenth person in a line.

A sample you get when you ask for volunteers.

Definitions

For example if you had a survey on the internet. Those who answered would do so voluntarily.

Exploring the various definitions in statistics

How big should your sample be? This is a question you must answer also. Try counting the colors in another bag. Get your friends to help. Count the colors in as many bags as you can. Now compare the means. As your sample size gets bigger the sample will more accurately describe the population, but you must also not choose a sample size to big to realistically carry out the survey.Don't see what you're interested in?

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This is “Exploring Types of Support”, section from the book Public Speaking: Practice and Ethics facts and statistics, definitions, examples, narratives, testimony, and analogies.

These courses will better prepare you to understand the various statistics you will encounter.

Exploring Types of Support