Random Representative Biased Samples

All students' names have been placed in a bowl. To determine what the favorite subject is of JDMS students, Mrs. Brantley draws out 100 names and asks those students what their favorite subject is. Is this representative or biased?

• Representative Sample

• Biased Sample

Middle school students are chosen at random to determine the average shoe size of middle school students.

• Representative Sample

• Biased Sample

Jeremy is trying to the determine the most popular color shirt worn on a particular day. He sits outside Walmart's doors and notes the color of the person's shirt who walks in the store every 5 minutes. Is this representative or biased?

• Biased Sample

• Representative Sample

The gatekeeper at the football game asks the first 50 people who come through the gate what their favorite sport is.

• Representative Sample

• Biased Sample

Ms. Madson wants to know how many students will attend the next 7^th grade after school dance.  She places all the 7^th grade students’ names in a jar and selects 50. Is this random or biased sampling?

• Random

• Biased

Random or Biased...
You want to know what percentage of students are in afterschool programs, so you get a list of all students and ask every 4th person on the list.

• Random

• Biased

Random or Biased...
You want to know what percentage of Maui people that go Oama fishing so you ask every 5th person you see at Kanaha Beach early in the morning... 

• Random

• Biased

Lester bought 2 eggs from each farmer at hte farmers' market. Each farmer had an equal number of eggs. Is this representative or biased?

• Representative Sample

• Biased Sample

Choose the true statement(s) about the census and sample shown.

• The sample could be considered too small.

• The sample is biased because is does not include everyone.

• The sample is representative of the population's sub-groups.

I surveyed 100 people at a grocery store by selecting every 3rd person that entered, does this sample represent the local population?

• Yes, it is random and unbiased.

• Yes, it is random and biased.

• No, while it is random, it is also biased.

• No, while it is random, it is also unbiased.