Middle School Math Sample Population Biased Unbiased

To determine if my students like Math, I surveyed every 3rd student that walked into my classroom. This is an example of a ...

• simple random sample

• systematic random sample

• convenience sample

• voluntary response sample

To determine how many students at Shull would attend the dance, the principal surveyed the students in Ms. Miller's math class. 10 students said they would attend and 15 said they would not attend. It can be concluded that half the students at Shull will attend the dance. Is this conclusion valid? Why or why not?

• Yes, this is a simple random sample. So the sample is unbiased.

• No, this is a convenience sample. So the sample is unbiased.

• No, this is a voluntary response sample. So the sample is biased.

• No, this is a convenience sample. So the sample is biased.

The Student Council asked every tenth student in the lunch line how they preferred to be contacted with school news. The results are shown in the table. Is this an unbiased sample? If yes, suppose there are 684 students at the school. How many can be expected to prefer E-mail?

• No, it's a biased sample

• 432

• 304

• 16

Determine if the conclusion is valid. A random sample of people at the mall shows that 22 prefer to take a family trip by car, 18 prefer to travel by plane, and 4 prefer to travel by bus. Is this sample method valid? If so, how many people out of 500 would you expect to say they prefer to travel by plane?

• The conclusion is valid, about 200 people

• The conclusion is not valid

• The conclusion is valid, about 205 people

• The conclusion is valid, about 250 people

A study wants to determine the average number of books read by students in a school year. They only survey students in the school library. Is this sample biased or unbiased?

• Biased

• Unbiased

The sample should REPRESENT the population so you can INFER what the larger group is like.

If you take a BAD sample, it does not allow you to make inferences about the larger population.

Choose the option below that says "Biased Sample"

• A sample that accurately represents the population

• A sample that is selected randomly from the population

• Biased Sample

A survey collects data by interviewing every fifth house in a neighborhood about their water usage. Is this sample biased or unbiased?

• Biased

• Unbiased

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

Simple random sample and systematic random sample are two types of ...

• biased samples

• unbiased samples

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 an unbiased 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