Representative Samples

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

• Representative Sample

• Biased Sample

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

Mrs. Leggett asks every 5th parent who walks in the office which is the best method of reaching them (phone, email, postal mail, etc.). Is this representative or biased?

• Biased Sample

• Representative Sample

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

What is a representative sample?

• A sample that includes every member of the population.

• B sample that reflects the distribution of the population in terms of center, shape, and spread.

• C sample taken from a specific subgroup of the population.

• D sample that is taken randomly without any specific criteria.

A school principal wants to see which subject the 695 students in his school liked best. Which choice BEST represents a representative sample?

• The girls in the school.

• 1 classroom for each grade

• All the students in the school.

• The students making a B in math.

Select all the reasons why random samples are preferred over other methods of getting a sample.

• If you select a random sample, you can determine how many people you want in the sample.

• A random sample is always the easiest way to select a sample from a population.

• A random sample is likely to give you a sample that is representative of the population.

• A random sample is a fair way to select a sample, because each person in the population has an equal chance of being selected.

True or False: all samples lead to a good prediction about an entire population.

• True

• False

The sample represents the population.

Choose the answer that says "Representative Sample"

• Random Sample

• Biased Sample

• Representative Sample

If you survey students in your town then your population is limited to students in your town.

What makes a sample representative?

• The sample is representative if it includes people from all over the world

• The sample is representative if it includes people from the same town

• The sample is representative if it includes people from the same country

• The sample is representative if it accurately reflects the group it is supposed to represent