Sampling Method Practice

Marianne wanted to know students' opinion on the new schedule at school. She places students' names in a container and randomly picks out 20 names. 

• Convenience Sampling
• Systematic Sampling
• Random Sampling
• Volunteer response

Disneyland often surveys its guests as they exit a restaurant during their visit. The surveyor stands at the restaurant exit, counts the number of people leaving, and surveys every 25th guest.
This is a form of:

• Random Sample
• Convenience Sampling
• Voluntary Response
• Systematic Sampling

An automobile dealer surveys its customers to determine their level of satisfaction with the services provided at the dealership.  The sample is chosen from a list of e-mail addresses.  Is this biased or unbiased?

• Biased
• Unbiased

4. A company makes DVDs and randomly selects 25 from 1500 to test them to see if they work.

• Biased
• Unbiased

What type of Sampling?

An auto analyst is conducting a satisfaction survey, sampling from a list of 10,000 new car buyers. The list includes 2,500 Ford buyers, 2,500 GM buyers, 2,500 Honda buyers, and 2,500 Toyota buyers. The analyst selects a sample of 400 car buyers, by randomly sampling 100 buyers of each brand.

• Random

• Stratified

• Systematic

• Cluster

A teacher splits her classes up by period. She then randomly picks 3 students from each period to do a survey.

• Stratified.

• Systematic

• Cluster

• Biased.

This sample is selected by dividing the population into subgroups and then taking a fixed number of units from each group using the simple random sample.

• stratified
• cluster
• judgment
• experimental

Units of the population are ordered in some fashion.  Usually, every k-th unit is chosen.

• proportional
• probable
• stratified
• systematic

Every possible group of units of the required size has the same chance of being the selected sample as any other sample of the same size.

• Simple Random 
• Thoughtful
• Typical
• Proportional

A sample survey is:

• the process of selecting a specified number of samples from multiple samples of a survey.

• a study that collects data from a sample that is chosen to represent a specific population.

• is limited to a study that asks people questions.

• designed in a way that limits the answers to a question by offering choices in multiple choice format.