Biased v Unbiased Samples

Which is the population?

• an entire deck of cards

• five heart cards

Which is the sample?

• blank NY state

• Red area on NY state

Which is the population?

• the jar

• the ones outside the jar

A restaurant would like to evaluate the efficiency of its workers, so they observe the workers during the second shift. Is this a biased or un biased sample?

An airport randomly selects inspects every 8th suitcase that goes through security.

• Unbiased

• Biased

To determine how many students plan to attend the school musical, Maria surveys 100 random people in the hallway.

• Biased

• Unbiased

To determine how many homes in his neighborhood plan to hand out candy on Halloween, Daniel chooses one street at random and surveys each household on that street.

• Biased

• Unbiased

At the end of the year, a math teacher decides to survey his students to determine what they liked best about his class. He uses his first period class as his sample.

• Unbiased

• Biased

To check lightbulbs for defects, 500 random bulbs from a certain production line are checked.

• Unbiased

• Biased

A total of 125 people were surveyed at the bake shop. What percent reported pumpkin pie as their favorite?

• 6.4%

• 80%

• 12%

• 20%