## How to do the test:

1. State your Null Hypothesis in the form: "There is no difference between the populations from which the two samples come"
2. Choose a Critical Significance Level (α: alpha) This is typically α = 0.05
3. Calculate the test statistic. Use a spreadsheet to calculate your results, or access a helpsheet for SPSS and check here for data entry into SPSS.
4. Reject or accept your Null Hypothesis.
Either:

1. Compare the calculated statistic with Critical Value:
CASE A - using critical values of the H statistic:
• If H ≥ Hcritical → reject H0 → significant result.
• If H < Hcritical → accept H0 → non-significant resul.t
CASE B - comparing H with critical values of the Χ2 statistic for large amounts of data:
• If H ≥ Χ2critical → reject H0 → significant result.
• If H < Χ2critical → accept H0 → non-significant result.
2. Look at the calculated probability (P value):
(SPSS calculates the X2 value)
• If P ≤ α → reject H0 → significant result.
• If P > α → accept H0 → non-significant result.

5. Report your results
Plot your data using the appropriate graphs.
Either:

• Kruskall-Wallis: H = …, df = …, P = …
• Kruskall-Wallis: Χ2 = …, df = …, P = …