Statistical Questions and Random Sampling

A quality inspector on an assembly line randomly chooses one of the first 50 ovens manufactured that day. This oven & every fiftieth oven thereafter get inspected. (example of a sample: oven #3,#53,#103, etc…or #17,#67,#117, #167, etc…) This type of sampling method is called:

• completely randomized design
• SRS simple random sampling
• systematic random sampling

Determine the type of sampling used in the following scenario: Divide students into freshmen/sophomores and juniors/seniors and then conduct a survey about the amount of time spent studying.

• Systematic
• Simple Random
• Cluster
• Stratafied

Determine the type of sampling used in the following scenario: Randomly generate 5 area codes from the state of New York and count the number of high school students for each high school in the area code region.

• Systematic
• Simple Random
• Cluster
• Stratafied

Determine the type of sampling used in the following scenario: Divide the users of the Internet into different age groups and then select a random sample from each age group to survey about the amount of time they spend on the Internet each month.

• Systematic
• Simple Random
• Cluster
• Stratafied

This sample consists of units of the population that are easily accessible.

• Cluster
• Convenience
• Volunteer
• Observational

Determine the type of sampling used in the following scenario: Divide students into freshmen/sophomores and juniors/seniors and then conduct a survey about the amount of time spent studying.

• Systematic

• Simple Random

• Cluster

• Stratified

Determine the type of sampling used in the following scenario: Randomly generate 5 area codes from the state of New York and count the number of high school students for each high school in the area code region.

• Systematic
• Simple Random
• Cluster
• Stratafied

Determine the type of sampling used in the following scenario: A psychologist uses a computer program to randomly select names from a list of students at a university.  The members of the sample will take a survey about student housing at the university. 

• Convenience
• Self-Selection
• Systematic
• Random

Determine the type of sampling used in the following scenario: An orange grower wishes to compute the average yield from his orchard. The orchard contatins 3 varieties: 50% of his trees are variety A, 25% of variety B, 25% of variety C. Suppose that the grower selects for his sample a 10 by 30 rectangular block of 300 trees of variety A, a 10 by 15 block of 150 B trees, and a 10 by 15 block of 150 C trees. What type of sampling is being used?

• Stratified Sampling
• Cluster Sampling
• Simple Random Sampling
• Convenience Sampling

Determine the type of sampling used in the following scenario: Ms. Dubovik samples her class by selecting every third person on her class list.  Which type of sampling method is this?

• Simple
• Systematic
• Stratified
• Cluster