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Two variables x and y are related by the linear equation ax + by + c = 0. The coefficient of correlation between the two is + 1, if

1) a is positive 2) b is positive 3) a and b both are positive 4) a and b are... View Article

1) 0.8 2) 0.6 3) 0.5 4) – 0.8 Solution: (1) 0.8 Rank in maths 2 4 3 5 1... View Article

1) r = [𝜎 x2 + 𝜎 y2 + 𝜎 x-y2] / [2 𝜎x 𝜎 y] 2) r = [𝜎... View Article

1) Both I and II 2) II only 3) I only 4) None of these Solution: (3) I only In... View Article

1) Perfect correlation 2) Perfect negative correlation 3) No linear correlation 4) None of the above Solution: (3) No linear... View Article

1) cov (x, y) / 𝜎 x 𝜎 y 2) cov (x, y) / 𝜎 y2 3) cov (x, y)... View Article

1) 0.4 2) 0.6 3) 0.3 4) 0.5 Solution: (1) 0.4 r = + √0.8 * 0.2 = 0.4

1) r = (1 / 2) (bxy + byx) 2) r = √bxy . byx 3) r = (bxy byx)2... View Article

1) 0.289 2) –0.289 3) 0.209 4) None of these Solution: (1) 0.289 r = √(- 3 / 12) (-... View Article

1) 0 2) –1 3) 1 4) None of these Solution: (1) 0 Coefficients of regression have different signs which... View Article

1) Both are positive 2) Both are negative 3) One is positive and another is negative 4) None of the... View Article

1) k ≤ 0 2) k ≥ 0 3) 0 ≤ k ≤ 1 / 4 4) 0 ≤ k ≤ 1... View Article

1) – 4 / 7, – 11 / 7 2) – 4 / 7, 11 / 7 3) 4 /... View Article

1) 9 / 25 2) 9 / 2 √5 3) 3 / 25 4) 9 / 50 Solution: (4) 9... View Article

1) 1.6 2) 6.4 3) 5.1 4) 3.2 Solution: (1) 1.6 The product of both regression on coefficients must be... View Article

1) y – 67 = (2 / 5) (x – 65) 2) y – 67 = (1 / 5) (x... View Article

1) r < –1 2) r = –1 3) r = 0 4) r = 1/2 Solution: (3) r =... View Article

1) 0 2) 1 3) 0.5 4) 0.33 Solution: (2) 1 If the lines of regression coincide, then the value... View Article

1) – 3.2 2) 3.2 3) 4 4) 0.16 Solution: (2) 3.2 0.8 = √0.2 * byx byx = 0.64... View Article

1) Greater than unity 2) Greater than or equal to unity 3) Less than or equal to unity 4) None... View Article