Bias Unbiased Sample

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

• Biased

• Unbiased

When a sample does not accurately represent the population it is a:

• Unbiased sample

• Biased sample

Mrs. Croix is conducting a survey to find out the favorite snack of fifth and sixth graders. She will ask a sample of 100 students. Which of the groups below should be surveyed to get the BEST representative sample?

• 20 students from each of the 5 local fifth- and sixth-grade schools.

• The first 100 students who go to a local baseball game

Imagine a company that crafts DVDs. Out of a grand collection of 1500, they play a mini-lottery and pick 25 lucky DVDs to test if they're ready to bring movies to life. What do you think about their selection method?

• Biased

• Unbiased

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?

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

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

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

When a sample does not accurately represent the population it is a:​ ​ (a)  

• Biased Sample

• Unbiased sample

Match the following

• Census

• Mrs. Garrett asks 5 of the students who walk into her classroom first how often they eat at Chick-fil-A in one week.

• Voluntary Response

• Mrs. Garrett puts the names of all her students in a hat and draws 5 names from the hat to ask how often they eat at Chick-fil-A in a week.

• Convenience Sample

• Mrs. Garrett asks all of her students how often they eat at Chick-fil-A in one week.

• Simple Random Sample

• Mrs. Garrett sends out a Schoology survey on the student services page to ask students at L-S how often they eat at Chick-fil-A in one week.