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# BIAS? - PowerPoint PPT Presentation

BIAS?. Essential Question:. SPI 606.5.3 How can you determine whether or not a sample is biased?. Biased Sample: A sample that does not fairly represent the population. Random : Each member of the population has an equal chance of being selected. Biased OR Not Biased.

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### BIAS?

SPI 606.5.3

How can you determine whether or not a sample is biased?

### Biased Sample:A sample that does not fairly represent the population

Random: Each member of the population has an equal chance of being selected

The first 25 students to arrive at school are surveyed to find out how they get to school.

An employee of a phone company randomly chooses 80 customers to ask whether they are happy with their service.

McDonald’s surveys 35 costumers off their french fry email list asking do they love their fries.

A famous musician randomly picks 1,000 people in the world to give backstage passes to their concert.

• COME UP WITH 1 BIASED SCENARIO

• COME UP WITH 1 NON-BIASED SCENARIO

LMS was buying new school equipment. Which group would most likely give you a biased answer?

A) All faculty and staff

B) Baseball coaches only

C) Parents of all athletes

A) Teachers only

B) Kindergarten students

C) A random group of middle school students

A survey was given about the best school lunch served in the cafeteria. The Cafeteria manager surveyed the LMS employees and made phone calls to parents to determine what the best lunch is.

• Is this sample biased?

• Why or Why not?

• What should be done differently so that it is unbiased?

The governor of Tennessee was trying to come up with a new program for middle schools in the area. He wanted to know what middle school students’ favorite hobby is. He decided to call 600 random families in the Murfreesboro area to conduct a survey to find out.

• Is this sample biased?

• Why or Why not?

• What should be done differently so that it is unbiased?

LMS is buying new equipment for the classrooms and were trying to decide how to spend the money. A survey was given to help make a decision. Which group would most likely give a biased answer?

• Parents of students

• Math teachers

• Teachers from all subject areas

• Random students in the auditorium.

TICKET OUT trying to decide how to spend the money. A survey was given to help make a decision. Which group

A company wants to survey teenagers to find out if they have heard of the company’s new clothing brand. Which sample group would most likely to be biased?

Teens from several different communities

Teens of a wide range of ages

Teens from different areas

Teens who shop at a certain store

2. The NFL was trying to decide who has the best fans. The NFL decided to conduct a survey to determine their answer. Which group should be surveyed so that the sample is not biased?