##### Asked by: Zayneb Lopez Hazas

asked in category: General Last Updated: 30th June, 2020# What is a chi square in genetics?

**Genes**

**Chi**-

**Squared**Tests.

**Chi**-

**squared**tests are a statistical measure that are used to determine whether the difference between an observed and expected frequency distribution is statistically significant.

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Also question is, what is a chi square test used for in biology?

**Chi**-**Square** (X2) **Test** for Independence **Chi**-**square Test** for Independence is a statistical **test** commonly **used** to determine if there is a significant association between two variables. For example, a biologist might want to determine if two species of organisms associate (are found together) in a community.

One may also ask, what does the chi square value mean? The **Chi**-**square** test is intended to test how likely it is that an observed distribution is due to chance. It is also called a "goodness of fit" statistic, because it measures how well the observed distribution of data fits with the distribution that is expected if the variables are independent.

Herein, what does it mean when a chi square test is significant?

9.2 - Statistical **Significance** of Observed Relationship / **Chi**-**Square Test**. IMPORTANT decision rule : An observed relationship will be called statistically **significant** when the p-value for a **chi**-**square test** is less than 0.05. In this case, we generalize that the relationship holds in the larger population.

How do we find the p value?

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**.