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51. F-Test is used to test the significance of the difference between/among
Two samples mean
More than two sample mean
Variable of two sample
Both (B) and (C)
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52. Which formula may be used for standard error.
S.E.= (Hr^2)/√N
S.E.= (1- r^2)/ N
S.E.= (1- r^2)/√N
S.E.= (1- r^2)/√(N+1)
53. β-error in hypothesis testing refers to
Type-I error
Type-II error
Both Type-I and II errors
None of the above
54. For testing of hypothesis Ho : M, = M, and H, : M, < M2, the critical value of z at 5% level of significance when the size of the sample is more than 30 is
1.96
2.32
1.645
2.5758
55. A change in μ , Standard Deviation (σ) remaining the same, the normal curve
Shifts the curve along the X axis
It changes the shape
It becomes symmetrical
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