# Which nonparametric test should you use to compare the results?

## Which nonparametric test should you use to compare the results?

A popular nonparametric test to compare outcomes between two independent groups is the Mann Whitney U test.

**Can you compare parametric and non parametric data?**

Parametric statistics are based on assumptions about the distribution of population from which the sample was taken. Nonparametric statistics are not based on assumptions, that is, the data can be collected from a sample that does not follow a specific distribution.

**What is the parametric test use to compare the means of two groups?**

If you want to compare the means of two groups then the right tests to choose between are the z-test and the t-test. One-sample (one-sample z-test or a one-sample t-test): one group will be a sample and the second group will be the population.

### Is Mann Whitney test nonparametric?

**How do you know which non parametric test to use?**

Non parametric do not assume that the data is normally distributed. The only non parametric test you are likely to come across in elementary stats is the chi-square test….Spearman Rank Correlation.

Nonparametric test | Parametric Alternative |
---|---|

Friedman test | Two-way ANOVA |

Kruskal-Wallis test | One-way ANOVA |

**Which measure of central tendency can be compared between different groups for nonparametric tests?**

The measure of central tendency is median in case of non parametric test.

## Is ANOVA parametric or non parametric?

ANOVA. 1. Also called as Analysis of variance, it is a parametric test of hypothesis testing.

**What is the difference between parametric and non-parametric test?**

The key difference between parametric and nonparametric test is that the parametric test relies on statistical distributions in data whereas nonparametric do not depend on any distribution. Non-parametric does not make any assumptions and measures the central tendency with the median value.

**What are the non-parametric test available in SPSS?**

Nonparametric Tests – One Sample

- SPSS Z-Test for a Single Proportion.
- Binomial Test – Simple Tutorial.
- SPSS Binomial Test Tutorial.
- SPSS Sign Test for One Median – Simple Example.
- SPSS Z-Test for Independent Proportions Tutorial.
- SPSS Mann-Whitney Test – Simple Example.
- SPSS Median Test for 2 Independent Medians.

### How do you determine if a parametric or nonparametric test should be used when analyzing data?

If the mean more accurately represents the center of the distribution of your data, and your sample size is large enough, use a parametric test. If the median more accurately represents the center of the distribution of your data, use a nonparametric test even if you have a large sample size.

**Does Mann Whitney compare means?**

The Mann-Whitney test compares the mean ranks — it does not compare medians and does not compare distributions.