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46. If each observation of raw data whose variance is σ2, is increased by λ, then variance of the new set is
σ2
λ2σ2
λ + σ2
λ2 + σ2
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47. If mode of a data is 18 and mean is 24, then median is
18
24
22
21
48. If μ is mean of distribution, then
is equal to
M.D.
Standard Deviation
0
None of these
49. byx bxy is equal to
p(X,Y)
cov(x,y)
(p(X,Y))2
50. If cov (X, Y) = 0, then which of the following is negative?
byx
bxy
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