Statistics & Probability Level 3C

Statistics & Probability Level 3C Mini Lesson

Samples & Populations

Biased & Unbiased

 _{How can you determine whether a sample accurately represents a population?} 

• ^{A population is an entire group of people or objects. A sample is a part of the population. You can use a sample to make an inference, or conclusion, about a population.} 

Multiple Select

Identify the population:

Multiple Select

Identify the sample:

Multiple Select

Identify the sample:

Multiple Select

Identify the population:

When a sample is selected at random, each member of the population is equally likely to be selected.

Multiple Choice

You want to know the favorite extracurricular activity of students at your school. Determine whether each method will result in a random sample.

You ask members of the school band.

• Random

• Not Random

Multiple Choice

You want to know the favorite extracurricular activity of students at your school. Determine whether each method will result in a random sample.

You publish a survey in the school newspaper.

• Random

• Not Random

Multiple Choice

You want to know the favorite extracurricular activity of students at your school. Determine whether each method will result in a random sample.

You ask every eighth student who enters the school in the morning.

• Random

• Not Random

Multiple Choice

You want to know the favorite extracurricular activity of students at your school. Determine whether each method will result in a random sample.

You ask students in your class.

• Random

• Not Random

Multiple Choice

A new power plant is being built outside a town. In each situation, residents of the town are asked how they feel about the new power plant. Determine whether each conclusion is valid.

A local radio show takes calls from 500 residents. The table shows the results. The radio station concludes that most of the residents of the town oppose the new power plant.

• Valid

• Invalid

Multiple Choice

A new power plant is being built outside a town. In each situation, residents of the town are asked how they feel about the new power plant. Determine whether each conclusion is valid.

A news reporter randomly surveys 2 residents outside a supermarket. The graph shows the results. The reporter concludes that the residents of the town are evenly divided on the new power plant.

• Valid

• Invalid

Multiple Choice

A new power plant is being built outside a town. In each situation, residents of the town are asked how they feel about the new power plant. Determine whether each conclusion is valid.

You randomly survey 250 residents at a shopping mall. The table shows the results. You conclude that there are about twice as many residents of the town against the new power plant than for the new power plant.

• Valid

• Invalid

Multiple Choice

I am a part of the population:

• sample

• population

• not valid

• valid

Multiple Choice

I represent an entire group of people, objects, animals, etc

• sample

• population

• not valid

• valid

Multiple Choice

When each member of a population is likely to be selected it is...

• random

• not random

• not valid

• valid

Multiple Choice

When a conclusion does not represent the population it is...

• random

• not random

• valid

• not valid

Open Ended

Give an example of a biased sample