## What does P value Show?

# What does P value Show?

## What does P value Show?

The p-value, or probability value, tells you how likely it is that your data could have occurred under the null hypothesis. It does this by calculating the likelihood of your test statistic, which is the number calculated by a statistical test using your data.

## What does a minus t value mean?

Find a t-value by dividing the difference between group means by the standard error of difference between the groups. A negative t-value indicates a reversal in the directionality of the effect, which has no bearing on the significance of the difference between groups.

## Where is the p value in Anova table?

The p-value (the area to the right of the F test statistic) is found using both the F table and the statistical software R.

## What does p value 0.0001 mean?

Also very low p-values like p<0.0001 will be rarely encountered, because it would mean that the trial was overpowered and should have had a smaller sample size. It would seem appropriate, therefore, to require investigators to explain such results and to consider rejecting the research involved.

## When should Anova be used?

The one-way analysis of variance (ANOVA) is used to determine whether there are any statistically significant differences between the means of two or more independent (unrelated) groups (although you tend to only see it used when there are a minimum of three, rather than two groups).

## What does P-value of 0.3 mean?

A p-value is calculated on the assumption that the null hypothesis is true. E.g. a p-value of 0.3 means “repeating the study many times, given that the null hypothesis + all other assumptions are true, I would see the result I’m seeing (or a more extreme result) 30% of time, so it wouldn’t be super unusual.

## What is treatment in Anova?

In an experiment, the factor (also called an independent variable) is an explanatory variable manipulated by the experimenter. Each factor has two or more levels, i.e., different values of the factor. Combinations of factor levels are called treatments.