Sampling Methods in Statistics

A teacher wants to know the average time spent doing homework by the students in her class of 20 girls and 5 boys.
She selects the first five who raise their hands.

• Systematic
• Convenience
• Voluntary Response
• Simple Random

A teacher wants to know the average time spent doing homework by the students in her class of 20 girls and 5 boys.
She selects the five closest to her desk.

• simple random
• Voluntary Response
• Convenience
• Systematic Random

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

• systematic
• simple random sample
• convenience
• volunteer response

I conduct a survey by splitting the school by grade, then asking 100 Freshmen, 100 Sophomores, 100 Juniors, and 100 Seniors.  Is this method:

• Clustered
• Self-Selected
• Random
• Stratified

A researcher randomly selects and interviews fifty male and fifty female teachers.

• simple random sampling
• stratified random sampling
• cluster sampling
• systematic sampling

Ms. Jeffries samples her class by selecting all students sitting at group 1 and group 5 in her classroom. This sampling technique is called?

• Simple

• Stratified

• Systematic

• Cluster

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 samples randomly from 300 trees of variety A, 150 of B, and 150 of C. What type of sampling is being used?

• Stratified Samplilng
• Convenience Sampling
• Simple Random Sampling
• Fruit sampling

To study the amount of time students spend doing homework each day, use a random number generator to select 25 students from the student enrollment database to survey.

• Convenience Sample
• Simple Random Sample
• Stratified Random Sample
• Interval Sample

To study the amount of time students spend doing homework each day, use a random number generator to select 25 freshmen, 25 sophomores, 25 juniors, and 25 seniors to survey.

• Convenience Sample
• Simple Random Sample
• Stratified Random Sample
• Interval Sample

Marianne wanted to know students' opinion on the new schedule at school. So she randomly selected 2 students from each class during second period. 
This is a form of:

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