Types of Bias
This type of bias is present when someone is led to respond falsely or inaccurately to a question.
Example:
"Would you go against the Second Amendment and support the harsher regulation of firearms?" is an example of this type of bias.
What is response bias?
You choose the names of 25 employees out of a hat from a company of 250 employees.
Identify the sampling method.
What is a Simple Random Sample (SRS)?
The part of an experiment that the researcher actively changes about the subjects.
Example:
If the experimental units were given 5mg, 10mg, 15mg of a medication, those amounts would be ____.
What is the treatment?
A sample is said to be this if it regularly over-estimates or under-estimates the data.
What is biased?
This response bias occurs when sampling units are unreachable or fail to answer a survey.
What is nonresponse bias?
You select every 5th customer from a list of 1,000 customers to survey.
Identify the sampling method.
What is a Systematic Sample?
This can only be proven by a well-designed experiment that uses random assignment.
What is cause and effect?
You are conducting research by randomly calling landline numbers.
Which type of bias is this?
What is undercoverage bias?
You randomly select 20 students from each of the Freshmen, Sophomores, Juniors, and Seniors to study the satisfaction THS students have with their guidance counselors.
Identify the sampling method.
What is a Stratified Random Sample?
Not a true experiment because there are no applied treatments, this can still be used to collect data on characteristics of interest in a sample.
("watch and see")
What is an observational study?
If you are recruited to participate in a taste test experiment, you would be acting as this.
What is an experimental unit?
This type of sampling bias occurs when a sample is comprised entirely of people who self-select to participate in a study.
Example: people who are more interested in the topic being studied or who have strong opinions on the topic may be more likely to participate in the study
What is voluntary response bias?
To study the proportions of colors of plain M&M's, you randomly select a three packages from the store and use all the M&Ms from these few packages.
Identify the sampling method.
What is a Cluster Sample?
Researchers are comparing a low-fat blueberry yogurt to a high-fat blueberry yogurt. Participants are randomly assigned to receive one type of yogurt. After tasting it, they complete an online survey.
The researchers know which yogurt containers are low-fat and which are high-fat, but participants are not told.
This is an example of _____.
What is single blinding?
You are studying the relationship between coffee consumption and heart disease.
Unhealthy behaviors like smoking, poor diet and lack of physical activity can contribute to heart disease. These are examples of _________ variables.
What are confounding variables?
This type of bias is present when, for example, an administration only interviews the first 100 students in the lunch line.
What is convenience bias ?
A TV show host asks his viewers to visit his website and respond to an online poll.
Identify the sampling method
What is Voluntary Sample?
The four (4) key elements of an experiment.
What are random assignment, comparison, replication, and control?
In an experiment on young group dynamics, a teacher divides a class into by gender before assigning them into groups.
This is an example of __?
What is blocking?