IM3 Stats: Types of sampling and populations

Identify the Population:

San Diego County Public Schools randomly selected 230 teachers to find out which technology resource it's teachers feel is the most effective.

• 230 Teachers

• All San Diego County Teachers

• Students

• San Diego County Public Schools

Ana wants to know the average student’s opinion of the tardy policy at her school. Which group of students should she survey in order to achieve the most accurate results?

• thirty students who are often tardy
• thirty students who are rarely tardy
• thirty of her friends
• thirty randomly selected students from her school

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A poll is a survey given to

• The entire population

• A sample of the population

'Bias' means

• a preference or a belief that is not supported by evidence

• When you cut a fabric diagonal across it's weave

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In statistics, a sampling bias is when

• the sample is a good representation of the population

• the sample does not truly reflect the population because the sample was selected in a wa that was unfair or biased

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Convenience sampling is asking people who are easy to find. This is likely to be unreliable and biased. Another common way of finding information quick is to ask people to phone in, or to ask questions from a website. This is likely to be unreliable and biased because it is 'self-selecting', only those motivated to respond will be included. Which of the following is an example of convenience sampling?

• A random sample fo mechanics in Australia are asked which brand they recommend

• You want to find out he health issues in your community, so you question people who come into the local medical clinic

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The best way to collect unbiased data is to use random sampling. This is where each member of the population has an equally likely chance of being chosen in the sample. Which of the following is an example fo random sampling?

• Asking people as they enter the supermarket which is their favourite supermarket

• Picking names out of a hat

• Measuring the height of students from one class of year 7s to find the average height of high school students at a particular school

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CCSS.HSS.IC.B.3

A casino wanted to run a number of trials to see if the die being used on the Blackjack table was biased. Which of the following would be necessary to make this judgement?

• a large number of trials are run

• a small number of trials are run

• a specific number of trials are run, depending on the time of day

This sample consists of units of the population that chose to respond.

• mandatory
• census
• volunteer
• unbiased

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Every possible group of units of the required size has the same chance of being the selected sample as any other sample of the same size.

• Simple Random 
• Thoughtful
• Typical
• Proportional

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