
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 the following four statements:
\\((1)\\) From a uniformly moving production assembly line, an inspector takes one product out of the stream for inspection of a certain index every \\(15\\) minutes. This type of sampling is systematic sampling;
\\((2)\\) The stronger the correlation between two random variables, the closer the absolute value of the correlation coefficient is to \\(1\\);
\\((3)\\) For the observed value \\(k\\) of the random variable \\(K^{2}\\) concerning categorical variables \\(X\\) and \\(Y\\), the smaller the value of \\(k\\), the more confident we are that "\\(X\\) and \\(Y\\) are related";
\\((4)\\) In the regression line equation \\(\hat{y} = 0.4x + 12\\), when the explanatory variable \\(x\\) increases by one unit, the predicted variable increases by approximately \\(0.4\\) units.
The indices of all true statements are ________.

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