Samples
This survey numbers every unit of the population and randomly generates numbers to select (each unit or group of units has the same chance of being selected)
What is Simple Random Sample(SRS)
This type of bias results from the way a question is asked.
Questionnaire Bias
This group is compared to experimental group to show that treatment is actually causing the response
What is control group or comparison group
The entire group of individuals that we want information about
What is population
A greenhouse with more light on the left than right growing plants. What design method should be used?
Blocked
This method of sampling attempts to contact every member of the population
What is Census
Individuals can choose on their own whether to participate in the sample.
What is Voluntary-Response Bias
What a subject in the control group receives
What is placebo
In this procedure, neither the subject nor the administrator know if treatment is true or a control.
What is double blind
A new medication for heart disease is being tested at different levels (1mg, 5mg and 10mg) including a placebo. How many treatments are present?
4
Population is divided into different groups based on a shared characteristic. SRS is then taken of each group.
What is Stratified Random Sample
When a large fraction of those sampled fails to respond. Those who do respond are likely to not represent the entire sample.
What is nonresponse bias
This term applies to the things being experimented when they are not people
What is experimental units
This term refers to the experimental design that is being used when experimental units are separated in an experiment because we believe an existing condition may cause different results
What is blocked design
What are the 2 ways to replicate an experiment?
1. Repeat on new subjects/experimental units
2. Have multiple subjects/experimental units in each treatment group
This sample type has a random start and then follows a pattern
What is Systematic Random
A sampling method that biases the sample in a way that give a part of the population less representation than it has in the population. A group has been left out.
What is under coverage
3 components of experimental design
What are control/comparison group, randomization, and replication
The experimental design where each subject is tested twice to compare outcomes
What is matched pairs
An experiment has 10 pots with 4 flowers in each pot. The pots are randomized into 2 groups and one group receives the new pesticide and one group receives the old pesticide. What are the experimental units?
Sample type where researcher takes a random samples of locations and surveys everyone at each location.
What is cluster sampling
People lie/answer untruthfully
What is response bias
Another variable may be influencing the outcome of the experiment
What is confounding
In this researchers don't impose a treatment on subjects, they just record what occurs.
When we make a conclusion about the population from a sample
What is a inference