Inferences from Samples about Populations

_______ is the entire group of objects or individuals considered for a survey.

• Sample

• Quartile

• Random Sample

• Population

_______ is a part of a group being surveyed.

• Sample

• Population

• Quartile

• Random Sample

_________ is a sample in which each individual or object in the entire population has an equal chance of being selected.

• Sample

• Population

• Random Sample

• Quartile

True or False: all samples lead to a good prediction about an entire population.

• True

• False

What is the difference between a sample and a population?

• Populations only consider a portion of the sample being studied.

• Samples only consider a portion of the population being studied.

• Populations do not always represent the entire group of people in question.

• Samples are generally much larger than populations.

Select all the reasons why random samples are preferred over other methods of getting a sample.

• If you select a random sample, you can determine how many people you want in the sample.

• A random sample is always the easiest way to select a sample from a population.

• A random sample is likely to give you a sample that is representative of the population.

• A random sample is a fair way to select a sample, because each person in the population has an equal chance of being selected.

The Magic Kingdom theme park has many attractions, one of which is Space Mountain. Are the people who ride Space Mountain the population or a sample of the theme park? Explain.

• Population. They are all the people at the theme park.

• Sample. They are a subset of all the people at the theme park.

• Both population and sample. They are all the people at the theme park

• Neither population nor sample. They are not the people at the theme park.

Determine if the following study is biased.

You want to know your Heathfield's favourite fast-food restaurant. You randomly ask 30 people their preference as they leave a Subway.

• Biased

• Unbiased

Determine if the following study is biased.

To see who has a computer at home the front office asks 10 randomly chosen students from each grade.

• Biased

• Unbiased

You want to know how many students catch the bus to go home.  You go to the bus stop and ask students how they go home from school.  Is this a random sample or biased sample?

• BIASED
• RANDOM