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Why do we need to estimate the variance of $\hat{\beta}_1|x_1, x_2,\ldots, x_n$ when we want to test a hypothesis about $\beta_1$?

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  • $\begingroup$ Please clarify your specific problem or provide additional details to highlight exactly what you need. As it's currently written, it's hard to tell exactly what you're asking. $\endgroup$
    – utobi
    Oct 16, 2022 at 21:26
  • $\begingroup$ Possible duplicate of stats.stackexchange.com/questions/485676/… and the comments provided there $\endgroup$ Oct 17, 2022 at 9:21

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