  ## 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:
Check your starting point.
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
NOTE: The calculation yields two values of the U statistic. Either can be used, but both the spreadsheet and SPSS use the smaller value. Thus:
1. Compare the calculated statistic with critical values (Critical values table):
• If X ≥ Xcritical → reject H0 → significant result.
• If X < Xcritical → accept H0 → non-significant result.
2. Look at the calculated probability (P 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.
(One-way Chi-square: X2 = …, df = …, N = …, P = …)