Sampling

​Lesson 6.1

Populations and Samples​

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Definitions:

Population: ​The total group or objects that you will be taking your sample from. Populations are usually the larger number.

Sample:​ A small part of the population that you are taking a survey on. The sample is usually the smaller number.

​Representative Sample: A sample that accurately reflects the population. When we are taking a sample our goal is to make it representative.

Random Sample: A sample that is conducted completely at random. Each person in the population has an equal chance of being selected.​

The sample will be a representative sample.​

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​Definitions:

Systematic Sample: A sample that is conducted based on a certain rule, such as every third of fifth person gets surveyed. This will yield a representative sample.

Convenience Sample: A convenience sample​ is done out of convenience such as asking 5 people around you or your closest friends. This will not yield a representative sample.

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Today's Goal:

In today's lesson we are going to learn the different type of sampling methods. Students are also going to learn the difference between a population and a sample.

Subject | Subject

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Example:

Of the 652 people on a cruise ship, 55 of them attended a magic show.

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What is the population?

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What is the sample?​

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Subject | Subject

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Example:

Of the 652 people on a cruise ship, 55 of them attended a magic show.

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What is the population?

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What is the sample?​

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Subject | Subject

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Multiple Choice

Of the 2,000 students in Golden Valley School District, 400 attend RMS. What is the population and sample in this problem?

• Population:

  400 at RMS

  Sample:

  2,000 in GVUSD

• Population:

  2,400 Total

  Sample:

  1,600 Difference

• Population:

  2,000 in GVUSD

  Sample:

  400 at RMS

• Population:

  2,400 Total

  Sample:

  400 at RMS

Example:

A journalism teacher wants to determine whether his students would prefer to attend a national writing convention or tour of a local newspaper press. The journalism teacher has a total of 120 students in 4 different classes. What would be a representative sample in this situation?​

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Multiple Choice

Mr. Miranda and Mr. Carbone want to take a survey about the Chapter 1 Test from their 7th grade students. Which method would yield a representative sample?

• Mr. Miranda asking all of the students in his 1st period class their opinion.

• Mr. Carbone asking 10 people from each class their opinion.

• Mr. Miranda and Mr. Carbone picking their 10 best students to survey.

• Mr. Miranda and Mr. Carbone asking 5 students per class their opinion.

Example:

A national appliance store chain is reviewing the performances of its 400 sales associate trainees. How can the store choose a representative sample of the trainees?

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Multiple Select

Dr. Grossman is taking a survey of the students at RMS. How can he insure his survey is a representative sample of the school?

• Survey 25 students from the 8th grade class.

• Ask all of the teachers their opinion on the topic and have them ask their best students.

• Survey 25 students at random from across the school.

• Survey 5 students per class during 1st period.

​Conclusion: Write two complete sentences about what you learned.