# It standard deviation for two variables X and Y are 3 and 4 respectively and their covariance is 8,then correlation coefficient between them is

1.  2/3

2.  8/3√2

3.  9/8√2

4.  2/9

4

2/3

Explanation :
No Explanation available for this question

# A system described by the transfer function H(s)=is stable. The constraints on α and K are

1.  α>o,αK

2.  α>o,αK>3

3.  α0

4.  α>o,αK

4

α>o,αK>3

Explanation :
No Explanation available for this question

# Mean deviation of the data α,α+d,α+2d,…α+2nd from the mean is equal to

1.  n(n+1)|d|/2n+1

2.  n(n+1)d/2n+1

3.  (n+1)|d|/2n

4.  None of these

4

n(n+1)|d|/2n+1

Explanation :
No Explanation available for this question

# Non-minimum phase transfer function is defined as the transfer function, which has

1.  Zeros in the right-half-plane

2.  Zeros only in the left-half s-plane

3.  Poles in the right-half s-plane

4.   Which has poles in the left half s-plane

4

Zeros in the right-half-plane

Explanation :
No Explanation available for this question

# If two variables X and Y have a perfect correlation(direct or indirect),then they may be connected by a relation of the type

1.  xy=a2

2.  a/x+b/y=1

3.  x/a+y/b=1

4.  none of these

4

x/a+y/b=1

Explanation :
No Explanation available for this question

# 25% of the items of data are less than 35 and 25% of the items are more than 75.Q.D of the data is

1.  55

2.  50

3.  10

4.  None of these

4

50

Explanation :
No Explanation available for this question

# If p>0 and m=byx+bxy/2,then

1.  m≥p

2.  m=p

3.  m≤p

4.  none of these

4

m≥p

Explanation :
No Explanation available for this question

# If two lines of regression are x+2y=7 and 2x+y=7,then regression equation of Y and X is

1.  2x+y=7

2.  x+2y=7

3.  x+2y=0

4.  2x+y=0

4

x+2y=7

Explanation :
No Explanation available for this question

# Two variables X and Y are connected by the relation ax+by+c=0 where ab

1.  a/b

2.  b/a

3.  -1

4.  1

4

1

Explanation :
No Explanation available for this question

# If X and Y are two independent variables such that σ2x=4 σ2y=9 and if u=3x+4y,v=3x-y,then p(u,v) is equal to

1.  0

2.  1

3.  2/3

4.  None of these

4