
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
Given a scatter plot of a set of sample data $(x_{1},y_{1})$, $(x_{2},y_{2})$, …, $(x_{n},y_{n})$ ($n\geqslant 2$, $x_{1},x_{2},…,x_{n}$ are not all equal), where all sample points $(x_{i},y_{i})$ ($i=1,2,…,n$) are exactly on the line $y=- \frac {1}{2}x+1$, determine the correlation coefficient of this set of sample data.

Present the answer in LaTex format: \boxed{Your answer}
user