Bias and Unbiased Samples

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

• A. Unbiased sample

• B. Biased sample

Biased or Unbiased?

John wants to find out what the favorite soda flavor is at Menifee County. He decides to ask all the students in Mr. Goldsmith's class as a sample group.

• Biased

• Unbiased

Biased or Unbiased?

Reign wants to determine the most popular brand of cereal in all of Kentucky. So he polls all the houses on his street to get a sample.

• Biased

• Unbiased

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

• Unbiased sample

• Biased sample

A school surveys all 7th grade boys to determine what to sell in the school store.  This sample is _________.

• Biased

• Unbiased

• Representative

• Peanut butter cups

Shelley wants to survey grocery shoppers about their favorite brands. She goes to the store at 8am and surveys the first 50 people. Is this a biased sample or unbiased sample?

• Biased Sample

• Unbiased Sample

Determine if the sample is biased or unbiased.

• biased

• unbiased

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

Match the following

• Simple Random Sample

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

• Census

• 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.

• Voluntary Response

• 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.

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