BIAS?

Essential Question:

SPI 606.5.3How can you

determine whether or not a sample is

biased?

Biased Sample: A sample that does not fairly represent the

populationRandom: Each member of

the population has an equal chance of being

selected

Biased OR Not Biased

The first 25 students to arrive at school are

surveyed to find out how they get to school.

Biased OR Not Biased

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

Biased OR Not Biased

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

Biased OR Not Biased

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

WORK WITH YOUR PARTNER

• 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 staffB) Baseball coaches onlyC) Parents of all athletes

A survey was taken about favorite video games. Who should be surveyed.

A) Teachers onlyB) Kindergarten studentsC) 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.

a)Is this sample biased?b)Why or Why not?c)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.

a)Is this sample biased?b)Why or Why not?c)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?

a)Parents of studentsb)Math teachersc)Teachers from all subject areasd)Random students in the auditorium.

TICKET OUT1.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?

a)Teens from several different communitiesb)Teens of a wide range of agesc)Teens from different areasd)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?

a)Titans cheerleadersb)Only people who live in Texasc)Major league baseball playersd)Football fans throughout the country.