Question 2Asked in DSSSB TGT Computer Science (Technical), 8 Aug 2021, Shift 2

If Σx = Σy = 12, Σx² = Σy² = 45, Σxy = 41 and n = 5, then what is the value of byx (regression coefficient)?

A71/81
B61/81
C81/61
D81/71

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Correct answer: (B) 61/81

Explanation

byx = (nΣxy − ΣxΣy) / (nΣy² − (Σy)²) = (5×41 − 12×12) / (5×45 − 144) = (205 − 144) / (225 − 144) = 61/81. Since Σx² = Σy², both denominators give the same value.

If Σx = Σy = 12, Σx² = Σy² = 45, Σxy = 41 and n = 5, then what is the value of byx (regression coefficient)?

From DSSSB TGT Computer Science PYQ (Technical), 8 Aug 2021, Shift 2