2021-06-25

## How do you read a hypothesis test?

7:37Suggested clip · 116 secondsUnderstanding Hypothesis testing, p-value, t-test for difference of …YouTubeStart of suggested clipEnd of suggested clip

## What is Z test used for?

A z-test is a statistical test to determine whether two population means are different when the variances are known and the sample size is large. It can be used to test hypotheses in which the z-test follows a normal distribution. A z-statistic, or z-score, is a number representing the result from the z-test.

What does P value indicate?

What Is P-Value? 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.

### Can P values be greater than 1?

A p-value tells you the probability of having a result that is equal to or greater than the result you achieved under your specific hypothesis. It is a probability and, as a probability, it ranges from 0-1.0 and cannot exceed one.

### Is P value always positive?

As we’ve just seen, the p value gives you a way to talk about the probability that the effect has any positive (or negative) value. To recap, if you observe a positive effect, and it’s statistically significant, then the true value of the effect is likely to be positive.