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(A) 3/26 Biased and Unbiased Samples (A)

Last updated over 1 year ago

21 questions

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Ticket eligible- 80 or above :)

Question 1

1.

Carlos wants to know the favorite sport of people at his school so he asks his baseball team.

Biased

Unbiased

Question 2

2.

A public library asked every 10th person who entered to name the type of book they were getting

Biased, Convenience Sample

Unbiased, Systematic Random Sample

Unbiased, Simple random

Biased, Voluntary Response

Question 3

3.

A hospital wants to open a gym. They ask the night-shift ER staff when they would use the gym.

Biased, Convenience Sample

Unbiased, Systematic Random Sample

Unbiased, Simple random

Biased, Voluntary Response

Question 4

4.

A company makes DVDs and randomly selects 25 from 1500 to test them to see if they work.

Biased

Unbiased

Question 5

5.

To see who has a computer at home the front office chooses 10 students randomly per grade to ask

Biased

Unbiased

Question 6

6.

The first 100 people at the park Thursday were asked if dogs should be off leashes in the park.

Biased

Unbiased

Question 7

7.

A senator wants to how she is doing. She sends a survey to 1000 registered voters in her party

Biased

Unbiased

Question 8

8.

Ana wants to know the average student’s opinion of the tardy policy at her school. Which group of students should she survey in order to achieve the most accurate results?

thirty students who are often tardy

thirty students who are rarely tardy

thirty of her friends

thirty randomly selected students from her school

Question 9

9.

Marcos wants to find out how many students at his school like to go to the movies. Which survey method is likely to produce a representative survey?

Ask the boys in the boys locker room.

Ask students coming out of a movie theater.

Ask every 5th student who enters the cafeteria

Ask half of the 34 students on the soccer team.

Question 10

10.

A restaurant wants to know if customers buy dessert when they eat out. As people leave the restaurant one evening, 20 people are surveyed at random. Eight people say they usually order dessert when they eat out. The restaurant concluded that most customers do not order dessert. Identify the sample.

20 customers

8 customers

All customers

Dessert

Question 11

11.

After ordering some shoes on amazon.com, amazon asks consumers to take a survey. What sampling method is amazon using?

Simple Random

Voluntary Response

Systematic Random

Convenience Sample

Question 12

12.

A sample should be

representative of  only middle school students only

a very large group

representative of the population

representative of people who volunteer

Question 13

13.

All 7th graders' names are put into a hat. 30 are randomly drawn to receive free ice-cream. Which sample method is used?

Simple Random Sample

Convenience Sample

Voluntary Response

Systematic Random Sample

Question 14

14.

Which sample methods yield valid results?

Simple Random and Systematic Random Samples

Simple Random and Convenience Sample

Systematic Random and Voluntary Response

Voluntary Response and Convenience Sample

Question 15

15.

Apple has a team that randomly inspects iPhones as they are manufactured. The team inspects every 25th phone that is produced. This is an example of what time of sample?

Convenience Sample

Voluntary Sample

Simple Random Sample

Systematic Random Sample

Question 16

16.

Evelyn wants to know what sport students at NGMS prefer. Students at NGMS is the population, but she surveys a sample of students. She collects data from her 7th grade homeroom one morning. Is this sample biased or unbiased? Why?

Biased because it is a convenience sample of just her homeroom.

Unbiased because she randomly selected her homeroom.

Question 17

17.

A restaurant owner leaves comment cards on all of the tables and encourages customers to participate in a survey to assess their overall experience in his restaurant. Is this an example of a valid or invalid sample? Why?

Valid because participants are able to randomly complete the survey. Samples choosen at random are usually representative of the population.

Invalid because this is an example of a voluntary survey. This type of sample is often biased due to customers that might have an extremely good or bad experience.

Question 18

18.

Each 7th grade teacher likes to give their students and equal opportunity to participate in class. In order to be fair they put the names of students in each class in buckets labeled Academic 1, Academic 2, Academic 3 and Academic 4. Each teacher random pulls a name from the bucket to select a student to answer questions during class. This is an example of which type of survey/selection process?

Convenience Sample

Voluntary Sample

Simple Random Sample

Systematic Random Sample

Question 19

19.

Dylan wants to determine the most popular music group or artist among Gwinnett County Middle School students. Which of the following samples will give him the most accurate results?

Surveying the students at North Gwinnett Middle School.

Surveying every 10th person entering the gates at a Harry Styles concert.

Surveying every 25th person on an alphabetical list of students from every Gwinnett County Middle School.

Surveying a group of people standing in Suwanee Town Center Park.

Question 20

20.

Oranges from an orchard need to be sampled to see if they are sweet enough for juice. The orchard has 25,000 orange trees. Each tree has at least 500 oranges. Claire decides to randomly choose 800 trees and test one orange from each tree. Is this sample representative? Why or why not?

No, this is not a representative sample and therefore biased because it is a convenience sample.

Yes, this is a representative sample and therefor unbiased because the trees are selected at random.

Question 21

21.

A clothing company wants to know what color leggings teenagers will buy. The company decides to spend one day in the junior departments of five randomly selected stores in randomly selected cities and ask every teenager who enters what color leggings they buy. Is this survey biased or unbiased? Why or why not?

Biased because the names of the cities and stores are not identified and every teenage that enters is surveyed.

Unbiased because the cities and stores are selected at random.