Using Samples to Predict

A nation-wide company wants to know which product consumers prefer. They randomly select 1,000 people who have purchased their products over the last 10 years.

Is the sample biased or unbiased?

• Biased

• Unbiased

A principal wants to know how his teachers feel about certain issues at school. He emails a

survey to 10 randomly selected teachers from each grade level.

Is the sample biased or unbiased?

• Biased

• Unbiased

A dog food company is making a new line of treats. To find out which flavors are preferred,

they ask 25 people who have purchased their brand of dog food.

Is the sample biased or unbiased?

• Biased

• Unbiased

A pizza store manager wants to know which pizza topping most people prefer. He surveys

everyone who places an order over the phone on one given night.

Is the sample biased or unbiased?

• Biased

• Unbiased

An apartment complex manager wants to survey residents about the apartment

maintenance service. A survey is sent to 100 randomly selected apartment numbers.

Is the sample biased or unbiased?

• Biased

• Unbiased

Jason wants to find out if students prefer football or basketball. He surveys the entire football

team.

Is the sample biased or unbiased?

• Biased

• Unbiased

Darren wants to find out whether 7th grade students prefer music, art or sports. He generates

150 random 7th grade names from the school enrollment list and surveys those students.

Is the sample biased or unbiased?

• Biased

• Unbiased

An ice cream shop surveyed 200 random customers to find out which new ice cream flavor they enjoy the most. Results are shown in the table.

What percent of the customers prefer orange cream?

• 36%

• 18%

• 5.56%

• 56%

An ice cream shop surveyed 200 random customers to find out which new ice cream flavor they enjoy the most. Results are shown in the table.

What percent of the customers prefer either peanut butter pop or green machine?

• 46%

• 54%

• 27%

• 8%

An ice cream shop surveyed 200 random customers to find out which new ice cream flavor they enjoy the most. Results are shown in the table.

If there are 1,400 customers in a given week, how many would you expect to prefer chocolate strawberry or very berry mix?

• 490 customers

• 55 customers

• 280 customers

• 770 customers