Occurs when an experimenter cannot tell the difference between the effects of different factors on the variable.
What is a confounding variable
100
Researcher observes and measures characteristics of interest of part of a population but does not change existing characteristics.
What is observational study
100
A count or measure of an entire population
What is census
100
Consisting of information coming from observations, counts, measurements, or responses
What is data
100
Consist of attributes, labels, or nonnumerical entries
What is qualitative data
200
Occurs when a subject reacts favorable to a placebo when in fact the subject has been given a fake treatment.
What is placebo effect
200
Researcher deliberately applies a treatment before observing the responses.
What is experiment
200
A count or measure of part of a population
What is sampling
200
The science of collecting, organizing, analyzing, and interpreting data in order to make decisions
What is statistics
200
Consists of numerical measurements or counts
What is quantitative data
300
A technique where the subjects do not know whether they are receiving a treatment or a placebo.
What is blinding
300
Part of a population that treatment is applied to and responses are observed.
What is treatment group
300
Difference between the results of a sample and those of the population
What is sampling error
300
The collection of all outcomes, responses, measurements, or counts that are of interest
What is population
300
Data is qualitative only. Data is categorized using names, labels, or qualities. No mathematical computations can be made at this level.
What is nominal level of measurement
400
A process of randomly assigning subjects to different treatment groups.
What is randomization
400
Part of a population in which no treatment is applied.
What is control group
400
Every member of the population has an equal chance of being selected
What is random sample
400
A subset, or part, of a population
What is sample
400
Data is qualitative and quantitative. Data at this level can be arranged in order, or ranked, but differences between data entries are not meaningful.
What is ordinal level of measurement
500
Groups of subjects with similar characteristics.
What is blocks
500
A harmless, fake treatment, that is made to look like the real treatment.
What is placebo
500
A sample in which every possible sample of the same size has the same chance of being selected
What is simple random sample
500
A numerical description of a population characteristic
What is parameter
500
Data can be ordered, and meaningful differences between data entries can be calculated. A zero entry simply represents a position on a scale; the entry is not a inherent zero.