
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
Among the following propositions, the correct ones are __________.

(1) The regression line $\hat{y}=\hat{b}x+\hat{a}$ always passes through the center of the sample points $(\bar{x}, \bar{y})$, and at least through one sample point;

(2) After adding the same constant to each data point in a set of data, the variance remains unchanged;

(3) The correlation index $R^{2}$ is used to describe the regression effect; it represents the contribution rate of the forecast variable to the change in the explanatory variable, the closer to $1$, the better the model fits;

(4) If the observed value $K$ of the random variable $K^{2}$ for categorical variables $X$ and $Y$ is larger, then the credibility of "$X$ is related to $Y$" is smaller;

(5) For the independent variable $x$ and the dependent variable $y$, when the value of $x$ is certain, the value of $y$ has certain randomness, the non-deterministic relationship between $x$ and $y$ is called a function relationship;

(6) In the residual plot, if the residual points are relatively evenly distributed in a horizontal band area, it indicates that the chosen model is relatively appropriate;

(7) Among two models, the one with the smaller sum of squared residuals has a better fitting effect.

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