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Foundations of Research I

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Hospital. ‎ Chi Square Statistics. ‎

Ethics -

Null and Alternate Hypotheses. Lit/Info Search. What is the difference between 2x2 factorial design experiment and a 2-way ANOVA. Probability and statistics. Hand Calculated Single Sample t Test (One Tail) One-Sample T-Test. It is perhaps easiest to demonstrate the ideas and methods of the one-sample t-test by working through an example.

One-Sample T-Test

To reiterate, the one-sample t-test compares the mean score of a sample to a known value, usually the population mean (the average for the outcome of some population of interest). The basic idea of the test is a comparison of the average of the sample (observed average) and the population (expected average), with an adjustment for the number of cases in the sample and the standard deviation of the average. Working through an example can help to highlight the issues involved and demonstrate how to conduct a t-test using actual data. Example - Prenatal Care and Birthweight One of the best indicators of the health of a baby is his/her weight at birth.

In the United States, mothers who live in poverty generally have babies with lower birthweight than those who do not live in poverty. Functional neural networks underlying response inhibition in adolescents and adults. ‎ Identifying Psychological Variables. Benjamin D.

Identifying Psychological Variables

Wright & Shirley A. Tuska, The School Review, Vol. 76, No. 3, September 1968 This Figure is useful for identifying and classifying basic aspects of human personality which have emerged consistently from Rasch analysis of psychological instruments. "Approach your problems from the right end and begin with the answers. Identifying Psychological Variables Wright B D, Tuska S A … Rasch Measurement Transactions, 1999, 12:4 p. Single Group Threats. « PreviousHomeNext » The Single Group Case What is meant by a "single group" threat?

Single Group Threats

Let's consider two single group designs and then consider the threats that are most relevant with respect to internal validity. The top design in the figure shows a "posttest-only" single group design. Where juvenile serious offenders live: A neighborhood analysis of Wayne County, Michigan. Sample Size Calculator - Confidence Level, Confidence Interval, Sample Size, Population Size, Relevant Population - Creative Research Systems. This Sample Size Calculator is presented as a public service of Creative Research Systems survey software.

Sample Size Calculator - Confidence Level, Confidence Interval, Sample Size, Population Size, Relevant Population - Creative Research Systems

You can use it to determine how many people you need to interview in order to get results that reflect the target population as precisely as needed. Internal Validity. Correlation does not imply causation. Assessment | Biopsychology | Comparative | Cognitive | Developmental | Language | Individual differences | Personality | Philosophy | Social |Methods | Statistics | Clinical | Educational | Industrial | Professional items | World psychology | Statistics:Scientific method · Research methods · Experimental design · Undergraduate statistics courses · Statistical tests · Game theory · Decision theory "Correlation does not imply causation" (related to "ignoring a common cause" and questionable cause) is a phrase used in science and statistics to emphasize that a correlation between two variables does not automatically imply that one causes the other (though correlation is necessary for linear causation in the absence of any third and countervailing causative variable, it can indicate possible causes or areas for further investigation; in other words, correlation is a hint).[1][2] Usage Edit In logic, the technical use of the word "implies" means "to be a sufficient circumstance.

Correlation does not imply causation

" Edit. Correlation, causation, and association - What does it all mean??? We Check Out the Numbers Behind the News. Causation vs.

We Check Out the Numbers Behind the News

Correlation One of the most common errors we find in the press is the confusion between correlation and causation in scientific and health-related studies. ‎ Qualitative Validity. Independent, Dependent, and Subject Variables. In experimental research, there is always at least one variable actively changed or manipulated by the experimenter.

Independent, Dependent, and Subject Variables

Generally it is the suspected cause in a cause-effect relationship. This is the independent variable. PHIL 230 Handout 1 Descartes' Meditations. The Method of Doubt. On the difference between science and philosophy. Attentive readers of this blog may have noticed that those who post comments to my entries often show two interesting and complementary attitudes: a fundamental distrust of (if not downright contempt for) philosophy , coupled with an overly enthusiastic endorsement of science.

On the difference between science and philosophy

Take, for instance, my recurring argument that some (but not all!) Of the “new atheists” engage in scientistic attitudes by overplaying the epistemological power of science while downplaying (or even simply negating) the notion that science fundamentally depends on non-empirical (i.e., philosophical) assumptions to even get started. Since my personal career , first as a scientist for 27 years, now as a philosopher, has been marked by experience in both fields, and moreover by a strong belief that the two enterprises are complementary and not adversarial, I feel it is time to make some extended comment on this general issue. Philosophy, on the other hand, is much harder to define . Arché. It is unusual to read a paper in contemporary philosophy that does not, at some central point, appeal to 'intuitions'.


Some philosophical concept, C, is under discussion. We are presented with a thought experiment in which a scenario, S, is imagined, and we are asked to have intuitions about whether C is instantiated in S. Some illustrations: Gettier's argument against the justified-true-belief theory of knowledge asks us to imagine someone who has justified true belief that p, but, intuitively, doesn't know that p. On the difference between science and philosophy. Psychology as a Science. By Saul McLeod published 2008 Science uses an empirical approach.

Psychology as a Science

Empiricism (founded by John Locke) states that the only source of knowledge comes through our senses – e.g. sight, hearing etc. Research Methods in Psychology: The Scientific Method. Research Methods in Psychology: The Scientific Method. ‎