Sampling Techniques Review

The school librarian wants to determine how many students use the library on a regular basis.  What type of sampling method would she use if she chose to use a random number generator to randomly select 50 students from the school's attendance roster.

• Convenience Sample

• Simple Random Sample

• Stratified Random Sample

• Interval Sample

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

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

• proportional

• probable

• stratified

• systematic

Identify the sampling design: The LFCC registrar wants to investigate attitudes of their graduates.  The registrar randomly selects 100 names from each of the four past graduating classes.

• cluster

• volunteer

• stratified

• simple random

Identify the sampling design: Mr. Rhoades puts all of his students' names in a hat and randomly selects one without looking.

• cluster

• volunteer

• systematic

• simple random

Identify the sampling design: Student government randomly samples 25 students of each of the four classes.

• stratified

• volunteer

• systematic

• simple random

Mrs. Trahan samples her class by selecting 5 girls and 7 boys.  This type of sampling is called?

• Stratified

• Systematic

• Simple

• Cluster

The school librarian wants to determine how many students use the library on a regular basis.  What type of sampling method would she use if she chose to randomly select 20 students in the cafeteria during each of the three lunch periods on Monday.

• Convenience Sample

• Simple Random Sample

• Stratified Random Sample

• Interval Sample

True or False: all samples lead to a good prediction about an entire population.

• True

• False

Mrs. Boyd wants to find the average height of all her students in her classes. She decides to use the first 5 people who walk in the door. Is this a good representative sample?

• Yes

• No