Unit 3 Vocab Flashcards
When a significant number of participants do not return their surveys. This could
result in bias.
Nonresponse bias
Every person or object of interest in a study
Population
Pick a sample and gather data about their past
Retrospective Study
The control treatment used in medical experiments.
Placebo
We must __________ aspects of the experiment that we believe will effect
response.
Control
A sample in which each group of n units has an equal chance of being selected
Simple Random Sample
When you randomly pick a starting point on a list and select every 5th person
thereafter.
Systematic Sampling
When individuals from a subgroup of the population are not represented
Undercoverage
When both those influencing the results and evaluating the results of an
experiment don’t know which treatment was applied to the participants.
Double Blind
When entire groups, which are representative of the population are chosen
randomly for a survey.
Cluster Sampling
A hopefully representative subset of the population
Representative Sampling
A combination of specific levels of the factors in an experiment. For example, a
new medication plus a high level of exercise.
Treatment
In an experiment, you need many subjects in order to assess the variation in
response and be confident our results are not just due to chance or other
variables.
Replication
Pick a sample and follow them into the future, observing and collecting data about
the sample.
Prospective Study
A data value (such as mean) attributed to the population or used as a value to
model the population.
Parameter