Biased vs Unbiased Samples

Front

What is a biased sample?

Back

A biased sample is one that does not accurately represent the population from which it is drawn, leading to skewed results.

Front

What is an unbiased sample?

Back

An unbiased sample is one that accurately represents the population, allowing for valid conclusions to be drawn.

Front

Why is Colton's poll of 22 people at the senior center not a random sample of town residents?

Back

It is not random because it only includes a specific group (senior center attendees) and does not represent the entire town.

Front

Why is Carlos's survey of his baseball team biased?

Back

It is biased because he only asks a specific group (his baseball team) rather than a diverse group of students.

Front

What makes the survey of the first 100 people at the park unbiased?

Back

It is unbiased because it includes a random selection of people arriving at the park, not just a specific group.

Front

What is a method to ensure an unbiased survey in a dealership?

Back

Sending the survey to every 5th customer who visits the dealership ensures a random selection.

Front

Why is Leslie's survey of the 9 youngest students not representative?

Back

It is not representative because it only includes the youngest students, ignoring the diversity of the entire student body.

Front

What is the importance of random sampling?

Back

Random sampling is important because it helps ensure that every member of the population has an equal chance of being selected, leading to more reliable results.

Front

How can bias affect survey results?

Back

Bias can lead to inaccurate conclusions, as the results may reflect the opinions of a specific group rather than the entire population.

Front

What is an example of a biased sampling method?

Back

Surveying only the members of a sports team to determine the favorite sport of all students is an example of biased sampling.