Sampling Method
Every seventh name is called from a list of cooks.
Systematic
A nurse asks patients who bought the new wheel chair if they like the company. What is the population?
Patients who bought the wheel chair.
What colour is John's spirit wear sweatshirt?
Navy blue
Citizens write a question on a slip of paper and put it in a hat. The mayor draws a question to discuss.
Random Sampling
A Lowe's manager asks the last 5 people that used a new snow blower if they liked it. What is the sample?
The last 5 people who used the new snow blower.
The sub group who is actually being surveyed.
Sample
What is 8 x 9?
72
We survey 10% of the students randomly selected from each of grades 9, 10, 11 and 12.
Stratified
The car rental store manager ask the last 15 customers if they liked their service. What kind of bias is this?
Convenience bias
An issue with a survey or data collection resulting in skewed results?
Bias
How old am I?
42
We select 5 classes at random, and survey every student in each of the 5 classes.
Cluster Sample
The real-estate agent asks the first 5 couples if they were interested in the house after an open house. What is the population and sample?
Population: all couples who went to the open house; Sample: the 5 couples s/he asked.
Every nth member of the population is selected.
Systematic Sampling
When is the provincial election?
June 2
A radio show is doing a phone in survey to find out is listeners support a certain political policy.
Voluntary-Response Sample
The principal asked the first 10 students who entered the school if they liked school. What is the possible bias?
Possible Bias: The first students who entered the school are more likely to like school.
Type of sampling at random from randomly chosen sub groups.
Stratified Sampling
How many days of classes are left this school year (not including today)?
18