correlation coefficient o Computed statistic reflecting the strength and

Correlation coefficient o computed statistic

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correlation coefficient o Computed statistic reflecting the strength and direction of an association between two variables. (-1.00 through 0.00) Direction o Positive: Two variables increase or decrease together. o Negative: One variable decreases as the other increases vice versa. Strength o How close the coefficient is to 1.0 determines the strength o Small =.1 to .3 o Medium= .3 to.5 o Large= .5 to 1.0 A true experiment o a type of experimental design and is thought to be the most accurate type of experimental research. o Control group and experimental group o Researcher-manipulated variable o Random assignment placebo effect o When behavior changes as a result of a person’s expectation of change rather than as a result of manipulation by an experimenter placebo control groups o The control group is given a placebo pill in order to judge the effects of an experiment double-blind control o Participants are unaware of what group they are in nor are the researchers aware of who is the control and who is not Single-case designs= Repeated measurement o Behavior/other client characteristic is measured several times throughout the trial Withdrawal design o the researcher tries to determine whether the independent variable is responsible for a change in behavior. multiple baselines o Measures are taken on two or more behaviors or on a single behavior in two or situations -Genetics- Phenotype : Observable characteristics of an individual Genotype : The specific genetic makeup of an individual
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Endophenotypes : Genetic mechanisms that contribute to the underlying problems causing the symptoms & difficulties experienced by ppl w/ psychological disorders. Human genome project . “ all the genes of an organism” scientific research project with the goal of determining the sequence of nucleotide base pairs that make up human DNA, and of identifying and mapping all of the genes of the human genome. Research designs : Plan of experimentation used to test a hypothesis. Between-groups: an experiment that has two or more groups of subjects each being tested by a different testing factor simultaneously cross-sectional design : a type of observational study that analyzes data from a population, or a representative subset, at a specific point in time. longitudinal design: a research design that involves repeated observations of the same variables (e.g., people) over short or long periods of time Random sample: a method of selecting a sample (random sample) from a statistical population in such a way that every possible sample that could be selected as a predetermined probability of being selected. Chapter 2: An Integrative Approach to Psychopathology One dimensional vs. multi-dimensional models One dimensional model : attempts to trace the origins of behavior to a single cause. Ex: Schizophrenia or a phobia is caused by a chemical imbalance or by growing up surrounded by overwhelming conflicts among family members.
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