Biased and unbiased samples

What type of survey sample is it when the entire population is being equally represented?

• Unbiased sample
• Biased sample

What type of survey sample is it when one portion of the population is favored over another?

• Unbiased sample
• Biased sample

What type of a survey is it when every person in the population has an equal chance of being selected?

• Systematic Random Sample
• Convenience Sample
• Simple Random Sample
• Voluntary Response Sample

What type of a survey is it when members of the population are chosen because they are easily accessible?

• Systematic Random Sample
• Convenience Sample
• Simple Random Sample
• Voluntary Response Sample

What type of a survey is it when items or members of the population are selected by a specific time or interval?

• Systematic Random Sample
• Convenience Sample
• Simple Random Sample
• Voluntary Response Sample

What type of a survey is it when the members of the population want to participate in answering the questions?

• Systematic Random Sample
• Convenience Sample
• Simple Random Sample
• Voluntary Response Sample

Determine if the conclusion is valid.
To evaluate the quality of their product, a manufacturer of cell phones checks every 50th phone off the assembly line.  Out of 200 phones tested, 4 are defective.  The manager concludes that about 2% of the cell phones will be defective.

• The conclusion is valid
• The conclusion is not valid

Tags

CCSS.7.SP.A.2

Determine if the conclusion is valid.
To determine whether the students will attend an arts festival at the school, Oliver surveys his friends in the art club.  All of Oliver's friends plan to attend.  So, Oliver assumes that all of the students at his school will also attend.

• The conclusion is valid
• The conclusion is not valid

Tags

CCSS.L.6.5B

CCSS.L.8.5B

CCSS.W.11-12.2D

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 plan, 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?
Bus = 9%
Plane = 41%
Car = 50%

• 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