# How to use the FTEST function

**What is the FTEST function?**

The FTEST function calculates the value from an F-test. The value shows if the variances from two data sets are not significantly different.

**What is the two-tailed probability from an F-test?**

The two-tailed probability from an F-test refers to testing against the alternative hypothesis that the two population variances are not equal without specifying direction.

The F-test compares two sample variances by forming a ratio that follows an F-distribution. It tests the null hypothesis that the population variances are equal.

If the variances are not equal which can occur in either direction meaning one could be larger or smaller. A two-tailed test checks both flanks of the F distribution for the probability that the ratio is quite large or quite small. The two-tailed p-value is the total area in both tails combined.

**What is a hypothesis in statistics?**

In statistics, a hypothesis is an assumption about some aspect of a population or underlying probability model. Hypotheses are of two main types:

- Null hypothesis (H0) - Represents the status quo. Asserts there is no meaningful effect, relationship, or difference in the parameter of interest between groups.
- Alternative hypothesis (H1) - Asserts there is a statistically significant effect in the parameter. Reflects a potential research finding or relationship.

A statistical hypotheses state an assumption that can be tested to reach conclusions from experimental data using methods like t-tests, ANOVA, or chi-square tests.

**What is the F probability?**

The F-distribution or F-ratio is a continuous probability distribution that compare the variances of two populations.

**What is variance?**

The variance shows how much a set of numbers are spread out from their average value.

Î£(x- xÌ„)^{2}/(n-1)

xÌ„ is the sample mean

n is the sample size.

**What is a null distribution?**

The null hypothesis in the F-distribution is that two independent normal variances are equal. If the observed ratio is too large or too small, then the null hypothesis is rejected, and we conclude that the variances are not equal.

**When is a f-distribution used?**

The F-distribution is used in the F-test in analysis of variance comparing two variances, as the distribution of the ratio of sample variances when the null is true of no difference between population variances.

**What is a continuous probability distribution?**

A continuous probability distribution is defined over an interval and range of continuous values, giving the probability an outcome is exactly equal to any value, and having an area under its probability density curve equal to 1.

## FTEST Function Syntax

FTEST(*array1, array2*)

## FTEST Function Arguments

array1 |
Required. The first data set. |

array2 |
Required. The second data set. |

## FTEST Function Example

Formula in cell D12:

## FTEST Function not working

The arguments must contain numbers or cell references to numbers.

Text, boolean and empty values are ignored.

The FTEST function returns

- #DIV/0! error value if the number of items in each data set don't match.
- #VALUE! error value if any argument is non-numeric.

## How to calculate F statistics?

The LINEST function calculates the F statistic whereas the FTEST function calculates the probability.

## How to calculate the Ftest using an Excel add-in

### Functions in 'Compatibility' category

The FTEST function function is one of 21 functions in the 'Compatibility' category.

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