
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
The following statements are given:

1. Linear regression analysis is the mathematical method of finding a straight line that fits close to these sample points from the sample points;
2. The scatter plot of sample points can be used to intuitively judge whether the relationship between two variables can be represented by a linear relationship;
3. Through the regression equation $\widehat{y}=\widehat{b}x+\widehat{a}$, it is possible to estimate the values and trends of observed variables;
4. Since a linear regression equation can be obtained from any set of observed values, there is no need to perform a correlation test.

The number of correct statements is ______.

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