Flashcards in Modules 6-8 Vocabulary Deck (43)
- a measure of the extent to which two variables change together, and thus of how well either variable predicts the other.
- a statistical index of the relationship between two variables (from -1.0 to +1.0)
- a graphed cluster of dots, each of which represents the values of two variables.
- the perception of a relationship where non exists.
- a research method in which an investigator manipulates one or more factors (independent variable) to observe the effect on some behavior or mental process (the dependent variable).
- in an experiment, the group exposed to the treatment, that is, to one version of the independent variable.
- in an experiment, the group not exposed to the treatment.
-assigning participants to experimental and control groups by chance, thus minimizing preexisting differences between the different groups.
- an experimental procedure in which both the research participant and the research staff are ignorant (blind) about whether the research participants have received the treatment or a placebo.
- an experiment in which the participants are unaware of who received the treatment.
- experimental results caused by expectations alone.
- the experimental factor that is manipulated; the variable whose effect is being studied.
- the outcome factor; the variable that may change in response to manipulations of the independent variable.
- a factor other than the independent variable that might produce an effect in an experiment.
- the extent to which a test or experiment measures or predicts what it is supposed to.
- numerical data used to measure and describe characteristics of groups.
- a bar graph depicting a frequency distribution.
- the arithmetic average of a distribution, obtained by adding the scores and then dividing by the number of scores.
- the middle score in a distribution; half the scores are above it and half are below it
- the most frequently occurring score in a distribution.
- a representation of scores that lack symmetry around their average value.
- the difference between the highest and lowest scores in a distribution.
- a computed measure of how much scores vary around the mean score.
- a symmetrical, bell-shaped curve that describes the distribution of many types of data.
- numerical data that allow one to generalize- to infer from sample data the probability of something being true of a population.
- a statistical statement of how likely it is that an obtained result occurred by chance.
- exists when one variable decreases as the other variable decreases, or one variable increases while the other increases.
- a relationship between two variables in which one variable increases as the other decreases, and vice versa.
- a measurement of the amount of people who respond to a certain call-to-action.