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### Exercise 3676. Points 4, theme: Non-parametric Correlation

Open exercise
The relationship between the same person self-appraisal and assessment from others was investigated in a student group. Estimates were given in 10 points system. The results are following. The order of persons in both lines is the same.
Self-appraisal 10 4 6 9 8 4 3 5 8 8 7 8 1 7 7 10 7
Mean assessment from others 5 7 5 3 8 6 7 5 10 9 5 4 8 2 4 3 4
1. Are these samples dependent or independent?
2. How strong is the Kendall tau correlation between these estimates?
3. What is the direction of the correlation?
4. Why Pearson R is not appropriate for these data?
5. Why sign test is not suggested here?

### Instructions

Copy the data lines from the exercise text. Whichever statistical software package can be used but notice that data must be prepared according to the tool demands.
• In the SDC, select Non-spatial correlation.
• Transpose the data from lines to columns. In Excel you can use Data → Text to columns. Select the data block and transpose it (Data → Copy → Paste special → Transpose).
• Copy the two transposed data columns to the SDC.
• Notice that one value pair represents one and the same person.