Confidence Interval for Regression Slope

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A regression analysis on a sample of size $n = 20$ yields a sample slope of $b = 0.75$ and a standard error of the slope of $s_b = 0.05$ . Which of the following is the approximate 95% confidence interval for the true slope, $\beta$ ?

Approximately (0.70, 0.80)

Approximately (0.645, 0.855)

Approximately (0.55, 0.95)

Approximately (0.75, 0.80)

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