Making Predictions with Samples and Populations

A school principal wants to offer an after-school club setting. She decided to survey 300 students about this. Which word best describes the survey she conducts? 

• Population
• Sample
• Census
• Prediction

In a sample of voters in Harrisburg, 18 out of 25 favored creating a new shopping center. If 50,000 people vote in the next Harrisburg election, how many are likely to vote in favor of the new shopping center based on this sample?

• 40,000
• 14,000
• 36,000
• 28,000

A candidate for city chancellor wants to poll voters to see how well her campaign is going. What collection method should she use to gather her information?

• Polling random grocery shoppers at the local market
• Posting signs around town asking people to call in to voice their opinion
• Calling a group of randomly selected registered voters

In Cyprus City there are 12,000 adults. 7,500 of the adults in the town are registered voters. In a poll to predict who will be the next mayor, a statistician asks 500 registered voters who they plan on voting for mayor. Is the sample he chose biased or unbiased?

• Biased
• Unbiased

The class has been assigned the task of predicting the next student council president. Which question is most appropriate for this task?

• Do you like Janelle or Tristan?
• Are you going to be voting in the student council election?
• Are you going to vote for Janelle or Tristan?

Hanna is a statistician for a very prominent soda company that markets to the entire US. However, she is currently in trouble because her latest prediction was not accurate. Identify the problem area of her survey.

• She randomly selected people from each state where their products are sold.
• She asked them to rate 10 products on a scale of 1-10 (1 being least favorite and 10 being most favorite)
• She selected a total of 5 people from each state.

Samantha conducted a survey in her school to see how many people like the student rewards. She asked 75 students on her team. Is this a valid survey? 

• Valid
• Not Valid 

Suppose 7/10 of people surveyed agree that dogs are the best pets to own. How many people out of 500 would you expect to say they DO NOT think dogs are the best pet?

• 350
• 200
• 250
• 150

A candidate for student council wants to poll students to see how well his campaign is going. What collection method should he use to gather his information?

• A simple random sample.
• A convenience sample
• A voluntary response sample

In a sample of people in the school district, 16 out of 25 favored building a new football stadium. If 6,000 people vote in the next local election, how many are likely to vote in favor of the new football stadium based on this sample?

• 2,980
• 3,840
• 2,160