Sampling in action
James wants to how many students want to go to Six Flags for a field trip, so he asks his 10 friends. What type of sample is this?
Convenience Sample
This type of sampling uses results or data that are conveniently and readily obtained.
What is convenience sampling?
The entire group being studied.
Population
True or False
Picking every 10th person who enters the library is a Simple Random Sample
False
The number of rooms on the 10th floor.
Quantitative (QN)
This sampling method can be conducted by picking names from a hat.
Simple Random Sampling
This type of sampling is when the population is divided into groups and a sample is drawn from each group.
What is stratified sampling?
Parts of the group being studied.
Sample
A scientist wants to test if different amount of fertilizer affect a plant's growth. What is the independent variable?
The amount of fertilizer
The color of a person's shirt.
Qualitative (QL)
Haylee wanted to see what sports her classmates enjoy. She split the middle school students by age and surveyed the 14 and 15 year old students. What sample is this?
Cluster Sampling
This type of sampling is when the population is divided into groups and some of the groups are randomly selected to be part of the sample.
What is cluster sampling?
A study that includes every single member of a population.
Census
Identify the correct sampling method
Separating students by age and then picking 10 from each group
Stratified Sample
The time it takes to go to the store.
Quantitative (QN)
Frankie wanted to find out how many 8th graders eat the school lunch. He split the 8th grade names into groups by last names and he surveyed the 5 students from each group. What is the sampling method?
Stratified Sample
This type of sampling is when a starting point is selected at random and the sample is selected with a certain interval.
What is systematic sampling?
Method of sampling in which the samples are collected in intervals
Systematic Sampling
A researcher wants to study the effects of a new medication on high blood pressure. They divide the participants into two groups. One group receives the new medication and the other receives a sugar pill. What is the sugar pill called?
Placebo
The grades you get in a class.
Quantitative
This sampling is best used when the population is ordered in some way, then every nth member is chosen
What is Systematic Sampling?
This type of sampling is when every member of the population has an equal change of being included in the sample.
What is a Simple Random sample?
Type of sampling at random from randomly choosing a sub group to survey
Stratified Sampling
A researcher wants to study the effects of a new medication on high blood pressure. They divide the participants into two groups. One group receives the new medication and the other receives a sugar pill. What is the group that receives the real medication?
Treatment Group
The numbers on football jerseys.
Qualitative