Margin of Error Plus Sampling

A representative for Macy's walks around the mall interviewing people about their brand perception of Macy's. What kind of sample is this?

• convenience sample

• random sample

• self-selected sample

• systematic sample

4010 people were surveyed concerning their thoughts on the upcoming election. What was the margin of error?

A research team surveys 1001 adults, asking them how many hours they work per week. What is the margin of error for this survey?

• 3%

• 32%

• 63%

• 9%

A recent survey found that out of 400 random American adults, 89% pay their bills on time. The margin of error in this survey was 2%. What is the interval of values in which the truth is likely found?

• 89% - 91%

• 87% - 89%

• 87% - 91%

• 388 - 402

A recent survey found that 77% of high schoolers use their phones more than 4 hours a day on average. The margin of error was 3%. What is the interval for which we could expect to find the truth of the population?

• 77% - 80%

• 74% - 77%

• 74% - 80%

• 50 million high schoolers - 120 million

_______ is a part of a group being surveyed.

• Sample
• Population
• Random Sample
• Quartile

_______ is the entire group of objects or individuals considered for a survey.

• Sample
• Population
• Random Sample
• Quartile

Elise, a supermarket employee, approached 50 random customers and asked whether they would be willing to discuss what they like most about the store.  She interviewed the 22 who said yes.  Is this sample of the supermarket's customers likely to be biased?

• yes
• no

A dealership assigns each car a number and then uses a random-number table to select the cars to be inspected.  What type of sampling is this?

• systematic

• random sample

• convenience

• self-selected

300 people were surveyed concerning their thoughts on the upcoming election. What was the margin of error?