## Our null hypothesis is that it is not.

**K1**. Perceptual Theory Loading. Perceptualpsychologists, Bruner and Postman, found that subjects who werebriefly shown anomalous playing cards, e.g., a black four of hearts,reported having seen their normal counterparts e.g., a red four ofhearts. It took repeated exposures to get subjects to say theanomalous cards didn’t look right, and eventually, to describethem correctly. (Kuhn 1962, 63). Kuhn took such studies to indicatethat things don’t look the same to observers with differentconceptual resources. (For a more up-to-date discussion of theoryand conceptual perceptual loading see Lupyan 2015.) If so, black heartsdidn’t look like black hearts until repeated exposures somehowallowed subjects to acquire the concept of a black heart. By analogy,Kuhn supposed, when observers working in conflicting paradigms look atthe same thing, their conceptual limitations should keep them fromhaving the same visual experiences (Kuhn 1962, 111, 113–114,115, 120–1). This would mean, for example, that when Priestleyand Lavoisier watched the same experiment, Lavioisier should have seenwhat accorded with his theory that combustion and respiration areoxidation processes, while Priestley’s visual experiences shouldhave agreed with his theory that burning and respiration are processesof phlogiston release.

For the fixed-sample size, when the number of realizations is decided in advance, the distribution of p is uniform, assuming the null hypothesis is true.

## An Application: Suppose we wish to test the null hypothesis

Research Questions

Interrogative statements that focus

on which variables or concepts are to be

described and the relationships that

might exist among them

Hypotheses

Formal statements of expected

relationships among variables

Types of Hypotheses

* Associative vs.

## Hypothesis vs Theory vs Fact ..

Given that there is a relevant profit (which could be negative) for the outcome of your decision, and a prior probability (before testing) for the null hypothesis to be true, the objective is to make a good decision.

## Conceptual And Operational Definition Psychology Essay

The probability of calculating a t value more extreme ( + or - ) than this, given that the null hypothesis is true, is equal or less than the risk we used in pulling the critical value from the table.

## Example Of Null And Operational Hypothesis - …

The"best" estimator is the one which is the closest to the population parameter being estimated: The above figure illustrates the concept of closeness by means of aiming at the center for .

## Conceptual definition- abstract meaning of a variable based on theory

Now, if the calculated t is more extreme than the critical value, we say,"the chance of getting this t, by shear chance, when the null hypothesis is true, is so small that I would rather say the null hypothesis is false, and accept the alternative, that the means are not equal." When the calculated value is less extreme than the calculated value, we say,"I could get this value of t by shear chance.

## Operational Definitions - Indiana University Bloomington

The conclusion based on this approach is as follows: If the computed statistic falls within the rejection region, then the null hypothesis; otherwise the null hypothesis (the claim).