Consider the following set of data:

x	y
2	9
5	-6
8	-7
15.5	-28
16.2	-15
14	-20
12	-15
13	-20.3
2.5	9
1	4.1
0.5	6
-3	12.1

Let’s see how to rank these values with the TI-Nspire.

1. Create a new document and select Add Lists & Spreadsheets. Enter the data in columns A and B.

   

2. Select all cells of columns A and B. Press and select Actions > Sort. Fill the parameters as follows and press .

   

3. Enter numbers from 1 to 12 in column C:

   

4. Select all cells of columns A, B, and C. Press and select Actions > Sort. Fill the parameters as follows:

   

   Press . This table should be displayed:

   

5. Enter numbers from 1 to 12 in column D. For duplicates in column B, use the mean of rankings. For example:
   • 4th and 5th positions: use 4.5 for both.
   • 10th and 11th positions: use 10.5 for both.

   

6. Perform a linear regression on columns C and D. Press and select Statistics > Stat Calculations > Linear Regression (\(mx+b\)). Fill the parameters as follows:

   

   The results should appear as follows:

   

   The \(r\)-value displayed is the ranked Spearman correlation coefficient.