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 biased 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
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
Which of the Cuzzins have different color eyes?
Stell
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?
What doesn't represent the population well and is not a fair survey?
Biased
Identify the correct sampling method
Separating students by age and then picking 10 from each group
Stratified Sample
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 Random 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
Is the sample biased or unbiased and then name the sample method.
Ms. Hairston wants to know how many teachers in Garrett Middle School have their Specialist Degree, so she surveys her cuzzins.
Biased and Convenience Sample
This sampling is best used when researchers have relatively good knowledge about the population to select the most useful sample members.
What is Purposive 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 random sample?
Type of sampling at random from randomly choosing a sub group to survey
Stratified Sampling
Ms. Brown wants to know how many of her staff members are going to Six Flags on Monday. What represents the population in this example?
Staff Members