standard divation, Econometrics

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demand for tea, Y, are assumed to be affected by income of students, X. A simple linear regres-sion analysis was performed on 20 observations and the results were:
Independent variable Regression coefficient Standard error t-value

Intercept -7.964633 3.11101359 -2.560
X 12.548580 1.27081204 9.874
find the standar divation?

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