Statistics CBSE Questions & Answers

Statistics

This is Mathematics Class 11 Statistics CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
A batsman scores runs in 10 innings 38,70,48,34,42,55,63,46,54 and 44 , then the mean deviation is
  • A
    6.4
  • B
    9.6
  • C
    8.6
    Correct
  • D
    10.6
2
The S.D. of the observations 22,26,28,20,24,30 is
  • A
    2
  • B
    3
  • C
    2.4
  • D
    3.42
    Correct
3
If the angle between two lines of regression is \({90^0}\) , then it represents
  • A
    no linear correlation
    Correct
  • B
    perfect negative correlation
  • C
    perfect positive correlation
  • D
    none of these
4
The two lines of regression are 2x - 7y + 6 = 0 and 7x – 2y +1 = 0. What is correlation coefficient between x and y ?
  • A
    4/ 49
  • B
    - 2/ 7
  • C
    2/ 7
    Correct
  • D
    none of these
5
The two lines of regression are x + 4y = 3 and 3x +y = 15 . value of x for y = 3 is
  • A
    - 4
  • B
    none of these
  • C
    - 9
  • D
    4
    Correct
6
The mean of 5 observations is 4.4 and their variance is 8.24. If three observations are 1,2 and 6 , the other two observations are
  • A
    4 and 8
  • B
    4 and 9
    Correct
  • C
    5 and 7
  • D
    5 and 9
7
If x and y are related as y – 4x = 3, then the nature of correlation between x and y is
  • A
    perfect negative
  • B
    no correlation
  • C
    none of these
  • D
    perfect positive
    Correct
8
Coefficient of correlation between the observations ( 1, 6 ) , ( 2 , 5 ) , ( 3 , 4) , ( 4 , 3 ) , ( 5 , 2 ) , ( 6 , 1 ) is
  • A
    - 1
    Correct
  • B
    0
  • C
    1
  • D
    none of these
9
If the two lines of regression of a bivariate distribution coincide, then the correlation coefficient \(\rho \) satisfies.
  • A
    \(\rho > 0\)
  • B
    \(\rho < 0\)
  • C
    \(\rho = 0\)
  • D
    \(\rho = 1or - 1\)
    Correct
10
For a moderately skewed distribution, quartile deviation and the standard deviation are related by
  • A
    S.D. = 4/3 Q. D.
  • B
    S.D.=3/2 Q.D.
    Correct
  • C
    S.D = 3/4Q. D.
  • D
    S.D. =2/3 Q.D.
11
Which one of the following average is most affected of extreme observations ?
  • A
    Mode
  • B
    A. M.
    Correct
  • C
    Median
  • D
    G.M.
12
The H.M. of 4,8,16 is
  • A
    6.7
  • B
    7.8
  • C
    6.85
    Correct
  • D
    6.4
13
The Mode of the following items is 0,1,6,7,2,3,7,6,6,2,6,0,5,6,0.
  • A
    5
  • B
    0
  • C
    6
    Correct
  • D
    2
14
The statistical method which helps us to estimate or predict the unknown value of one variable from the known value of the related variable is called
  • A
    correlation
  • B
    scatter diagram
  • C
    regression
    Correct
  • D
    dispersion
15
The coefficient of correlation r satisfies
  • A
    \( - {\text{ 1 }} < {\text{ r }} < {\text{ }}0\)
  • B
    \(0{\text{ }} < {\text{ r }} < {\text{ 1}}\)
  • C
    \({\text{I r I }} > {\text{ 1}}\)
  • D
    \({\text{I r I }} \leq {\text{ 1}}\)
    Correct