Quiz 2 Review

The term refers to the typical/central value for a probability distribution; colloquially, these are called averages.

Is this a positive or negative skew?

Study of an individual person or group in hopes of discovering a universal truth.

To infer from sample data the probability of something being true of a population.

A study in which neither the participants nor experimenters know which group received the treatment or placebo.

The basic rules established here in the US that protect participants.

Anonymous questionnaires.

Unhindered observations of the natural environment.

In an experiment, this is the group that receives the treatment.

Numerical data used to measure and describe characteristics of groups.

These are detailed instructions and procedures in order to replicate the experiment.

Studies that attempt to discover how 2 factors link together and predict one another.

In an experiment, this is the general idea gathered from observation that predicts an outcome.

Choosing a random portion of people from a given population for an experiment.

Observational study that analyzes data from a population, or a representative subset, at a specific point in time

This is a two-variable graph in which a slope may be used to infer a positive, negative, or no correlation

In an experiment, this is the group that receives the placebo.

In an experiment, this is a testable prediction about that outcome.

Observational research method in which data is gathered for the same subjects repeatedly over a period of time.

With statistics, this is the average measure of variance between scores around the mean.

Measures how strong a relationship is between two variables. The number itself ranges from -1 to 1

Randomly distributing the portion of the population into experimental groups to avoid bias.