Sample Survey and Biased Survey

A school district wants to know if parents would prefer to get phone calls or emails from the schools. They survey the parents of all the seventh grade students enrolled in the district. Is this a biased sample or unbiased sample?

• Biased Sample

• Unbiased Sample

Green Valley Middle School conducted a survey of 125 random students asking them how much time they spend each night on homework. Is this a biased sample or unbiased sample?

• Biased Sample

• Unbiased Sample

Debbie surveyed all the students who ride the bus to school to find how long they take to get ready in the morning. Is this a biased sample or unbiased sample?

• Biased Sample

• Unbiased Sample

A high school is going to have a party for their graduating seniors. They want to serve food that most of the seniors like. They pick 25 random names from a hat and survey those students. Is this a biased sample or unbiased sample?

• Biased Sample

• Unbiased Sample

At Centre Middle School, the 7th graders will conduct a survey to decide where they want to go on a field trip. Which method will result in the least biased decision?

• to randomly ask 8th grade students who went on a field trip last year

• to randomly choose some 7th grade students to select a location

• to ask all 7th grade teachers and administrators for a location

• to ask the Beta Club to choose a location

Casey surveyed the members of his soccer team to ask them what their favorite sport is. Is this a biased sample or unbiased sample?

• Biased Sample

• Unbiased Sample

An airline wants to know if people prefer to check their luggage or carry it on. They ask every 10th person that walks into the airport. Is this a biased sample or unbiased sample?

• Biased Sample

• Unbiased sample?

Choose the best sample.

• Sample A

• Sample B

To determine how much money college students spend on clothes each semester,a researcher surveys 450 college students as they leave the university library. Is this sample biased or unbiased?

• Biased because not everyone goes to the library

• Unbiased because 450 people is enough people to provide accurate data

• Biased because 450 is not enough people to provide accurate data

• Unbiased because everyone goes to the library

You want to estimate the number of students in a high school who ride the school bus. Which sample is best?

• 4 students in the hallway

• All students in the marching band

• 50 seniors at random

• 100 students at random during lunch