# How do I test for normality in Minitab?

## How do I test for normality in Minitab?

Choose Stat > Basic Statistics > Normality Test. The test results indicate whether you should reject or fail to reject the null hypothesis that the data come from a normally distributed population. You can do a normality test and produce a normal probability plot in the same analysis.

How do you do an Anderson Darling test on Minitab?

Show the Anderson-Darling statistic on a normal probability plot

1. Choose Tools > Options > Individual Graphs > Residual Plots for Time Series and Tools > Options > Linear Models > Residual Plots.
2. Check Include Anderson-Darling test with normal plot. Click OK.

### How do you do a Kruskal Wallis test in Minitab?

Example of Kruskal-Wallis Test

1. Open the sample data, HospitalBeds. MTW.
2. Open the Kruskal-Wallis Test dialog box. Mac: Statistics > ANOVA > Kruskal-Wallis. PC: STATISTICS > ANOVA > Kruskal-Wallis.
3. Select Responses are in one column for all factor levels.
4. In Response, enter Beds.
5. In Factor, enter Hospital.
6. Click OK.

How do you run Anderson-Darling test in Minitab?

## How does Shapiro-Wilk test normality?

If the Sig. value of the Shapiro-Wilk Test is greater than 0.05, the data is normal. If it is below 0.05, the data significantly deviate from a normal distribution.

Why do we test for normality?

A normality test is used to determine whether sample data has been drawn from a normally distributed population (within some tolerance). A number of statistical tests, such as the Student’s t-test and the one-way and two-way ANOVA require a normally distributed sample population.

### How do you get Anderson Darling test in Minitab?

Is Shapiro test reliable?

Results show that Shapiro-Wilk test is the most powerful normality test, followed by Anderson-Darling test, Lillie/ors test and Kolmogorov-Smirnov test. However, the power of all four tests is still low for small sample size. Assessing the assumption of normality is required by most statistical procedures.