# FAQ: How Do You Make A Decision Rule?

## What is an example of a decision rule?

A decision rule is a simple IF-THEN statement consisting of a condition (also called antecedent) and a prediction. For example: IF it rains today AND if it is April (condition), THEN it will rain tomorrow (prediction).

## What is decision rule in research?

In the context of statistical hypothesis testing, decision rule refers to the rule that specifies how to choose between two (or more) competing hypotheses about the observed data.

## What is the P-value decision rule?

If the P-value is less than (or equal to), then the null hypothesis is rejected in favor of the alternative hypothesis. And, if the P-value is greater than, then the null hypothesis is not rejected. If the P-value is less than (or equal to), reject the null hypothesis in favor of the alternative hypothesis.

## What are the types of decision rules?

Consumers use five decision rules: conjunctive, disjunctive, elimination-by-aspects, lexicographic, and compensatory. Consumers frequently use more than one rule to make a single decision.

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## What is lexicographic rule?

According to the lexicographic decision rule, a decision alternative is better than another alternative if and only if it is better than the other alternative in the most important attribute on which the two alternatives differ.

## What is the meaning of decision rule?

A decision rule is a procedure that the researcher uses to decide whether to accept or reject the null hypothesis. For example, a researcher might hypothesize that a population mean is equal to 10. He/she might collect a random sample of observations to test this hypothesis.

## What is the correct decision in statistics?

The decision is to reject H when H is false (correct decision whose probability is called the Power of the Test). α and β represent the probabilities. α = probability of a Type I error = P(Type I error) = probability of rejecting the null hypothesis when the null hypothesis is true.

## What is the economic decision rule?

Economic decision rule. A rule in economics asserting that if the marginal benefit of an action is higher than the marginal cost, then one should undertake the action; however if the marginal cost is higher than the marginal benefit of the action, one should not undertake it.

## What is p-value in hypothesis testing?

In statistics, the p-value is the probability of obtaining results at least as extreme as the observed results of a statistical hypothesis test, assuming that the null hypothesis is correct. A smaller p-value means that there is stronger evidence in favor of the alternative hypothesis.

## How do you find the p-value in a hypothesis test?

If your test statistic is positive, first find the probability that Z is greater than your test statistic (look up your test statistic on the Z-table, find its corresponding probability, and subtract it from one). Then double this result to get the p-value.

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## What is the p-value formula?

The p-value is calculated using the sampling distribution of the test statistic under the null hypothesis, the sample data, and the type of test being done (lower-tailed test, upper-tailed test, or two-sided test). The p-value for: a lower-tailed test is specified by: p-value = P(TS ts | H is true) = cdf(ts)

## How do you know when to reject the null hypothesis p value?

A p-value less than 0.05 (typically ≤ 0.05) is statistically significant. It indicates strong evidence against the null hypothesis, as there is less than a 5% probability the null is correct (and the results are random). Therefore, we reject the null hypothesis, and accept the alternative hypothesis.

## What does p value 0.05 mean?

P > 0.05 is the probability that the null hypothesis is true. A statistically significant test result (P ≤ 0.05) means that the test hypothesis is false or should be rejected. A P value greater than 0.05 means that no effect was observed.

## What does P 0.01 mean?

P < 0.01 ** P < 0.001. Most authors refer to statistically significant as P < 0.05 and statistically highly significant as P < 0.001 (less than one in a thousand chance of being wrong). The asterisk system avoids the woolly term "significant".