Random Samples Estimations

Using a random numbers table or selecting cards from a hat are examples of:

• cluster sampling

• stratified sampling

• systematic sampling

• random sampling

Assign each car in a dealership a number and then use a random-number table to select the cars to be inspected. 

• experiment

• simple random sample

• convenience

• volunteer response

What does sampling variability mean?

• The consistent results obtained when similar samples are drawn from different populations

• The natural tendency that each random sample will produce a different estimate

• The subjects in an experiment that negatively affect the accuracy of sample results

• The errors that occur due to incorrect data collection methods

According to a random telephone survey, 85% of all working adults in the U.S. are satisfied with their current job. If I asked 500 adults, how many do you predict would be satisfied with their current job?

• 85 adults

• 340 adults

• 500 adults

• 425 adults

• A
• B
• C
• D

Select all that apply!

• A

• B

• C

• D

• E

Which method would likely result in a random sample that is representative of the student population?

• Surveying all of the teachers at the school

• Surveying the students on the Student Council

• Surveying 100 students in the cafeteria at lunch

• Surveying 50 students who are in the school band.

A travel club has 3,000 members. A random sample of 50 of the club members found that 12 people like mountain vacations best. Which statement is NOT supported by the sample data?

• Twenty-four percent of those sampled say they like mountain vacations best.

• An estimated 720 club members would likely say they enjoy mountain vacations best.

• Almost one-quarter of club members would likely say they enjoy mountain vacations best.

• More than 2,500 club members would likely say they prefer other vacations over mountain vacations.

Identify the Sample: The Huddle House wants to know if their customers buy dessert when they eat out. As people leave the restaurant one evening, 20 people are surveyed at random. Eight people say they usually order dessert when they eat out. The manager at Huddle House concluded that most customers do not order dessert. What is the SAMPLE in this scenario?

• 20 customers from Huddle House

• All customers from Huddle House that evening

• 8 customers from Huddle House

• The employees from Huddle House

Ms. Wilson concludes that 85% of the students in the school have at least one pet after she conducts a survey of 25 students in her class. Is this survey a census or a sample?

• census

• sample

• not enough information to tell

• both