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7.1 Statistical Hypotheses
7.1 Statistical Hypotheses

... the rejection of the null hypothesis. That is, we want the probability of making a Type I Error to be small. (We’d rather actually be right and think we’re wrong than think we’re right and actually be wrong.) The maximum acceptable probability (of making a Type I error) is usually chosen at the begi ...
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... V ...
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... When you want to compare the means of two groups. When to use One-tailed or Two-tailed tests? The answer is that it depends on your hypothesis. If your hypothesis states the direction of the difference or relationship, then you use a one-tailed test. Example null hypothesis would include: Females wi ...
Statistical Cut Score Study
Statistical Cut Score Study

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1. An event that decreases the behavior that precedes it

... ____ 21. Any stimulus that, when removed after a response, strengthens the response is called a(n) A) conditioned stimulus. B) unconditioned stimulus. C) positive reinforcer. D) negative reinforcer. E) positive punishment. ____ 22. Which of the following is true of negative reinforcement and punishm ...
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... efforts to improve human or organizational performance through applications of the behavioral or management sciences are often acts of faith. It is hoped or believed that these efforts will yield benefits justifying the resources expended, but no one can say with any degree of certainty that this is ...
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Notes 23

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Simple Linear Regression

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Lab 01 MEASUREMENT AND UNCERTAINTY

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... of scores and not to know the mean of the population. • Repeated Measures Design – research design in which each person is tested more than once – For this type of design, a t test for dependent means is used. • The means for each group of scores are from the same people and are dependent on each ot ...
A Simplified Introduction to Correlation and Regression K. L. Weldon
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... definition also has the advantage of being described in words as the average product of the standardized variables. No mention of variance or covariance is necessary for this. The regression line zy=r zx is simple to understand. Moreover, the tendency of regression toward the mean is seen to depend ...
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... The derivation for this mean and variance for a Bernoulli variable, with standard deviation being the square root of the variance, is taught in the first semester of a masters degree level statistics program. The important point about the formulas is that they just use the nominal scale property of ...
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... Correlation is a technique that summarizes the relationship between 2 paired variables. The technique gives one number, the correlation coefficient, that expresses whether:  “higher” numbers in one variable tend to be paired with “higher” numbers in the other variable (a positive correlation),  or ...
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Classical Conditioning

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Inference for Proportions

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... Rogers’s theory of development posits that conditional love leads to a need to distort experiences, which fosters an incongruent self-concept. Incongruence makes one prone to recurrent anxiety, which triggers defensive behavior, ...
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Math1342: Statistics: Final Review

... B) 2; Not a simple event because it is an event that consists of more than a single outcome. C) 1; Simple event because it is an event that consists of a single outcome. D) 3; Not a simple event because it is an event that consists of more than a single outcome. 2) You randomly select a computer fro ...
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... one type has an average ultimate testing strength (in ksi) of 83.2 with a standard deviation of 5.2 and a sample of 8 welds of the other type has an average strength of 71.3 with a standard deviation of 3.1. • It is easy to compute a point estimate for the difference in strengths. The difference bet ...
CNM Handbook for Educational Research (doc)
CNM Handbook for Educational Research (doc)

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Psychometrics

Psychometrics is a field of study concerned with the theory and technique of psychological measurement. One part of the field is concerned with the objective measurement of skills and knowledge, abilities, attitudes, personality traits, and educational achievement. For example, some psychometric researchers have, thus far, concerned themselves with the construction and validation of assessment instruments such as questionnaires, tests, raters' judgments, and personality tests. Another part of the field is concerned with statistical research bearing on measurement theory (e.g., item response theory; intraclass correlation).As a result of these focuses, psychometric research involves two major tasks: (i) the construction of instruments; and (ii) the development of procedures for measurement. Practitioners are described as psychometricians. All psychometricians usually possess a specific qualification, and while most are psychologists with advanced graduate training, many work for the government or in human resources departments. Others specialize as learning and development professionals.
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