Deck 1: Statistical Analysis and Time Series Forecasting

Question 1

The median of a series is 10. Two additional observations 8 and 15 are added to the series. The median of the new series will be ____________________

A)8
B)15
C)11
D)10

Answer 1

10

Question 2

If the mean ages of a group of boys is 20 years, then the mean of their ages after 2 years is __________

A)20
B)22
C)10
D)None of these

Answer 2

22

Question 3

The median of a frequency distribution is graphically with the help of ______________-

A)Graph
B)Ogive
C)Mode
D)None of these

Answer 3

Ogive

Question 4

Find the value of x, if the mode of the data is 25. 15,20,25,18,14,15,25,15,18,16,20,25,20,x

A)20
B)10
C)25
D)None of these

Question 5

Two types of ogives meet at ______________

A)Mode
B)Mean
C)Median
D)None of these

Question 6

The mode of a frequency distribution can be determined graphically by

A)Median
B)Ogive
C)Histogram
D)None of these

Question 7

Calculate median 35,23,45,50,80,61,92,40,52,61

A)23
B)50
C)80
D)51

Question 8

Find the range and the coefficient of range for the following values 25,32,85,32,42,10,20,18,28

A)25
B)85
C)10
D)75

Question 9

Variance= _______________

A)S.D
B)X
C)C.V
D)S.D2

Question 10

If all the values of a series are multiplied by 5 what happens to the S.D

A)Decreasing by 5
B)Increasing by 5
C)Multiplied by 5
D)None of these

Question 11

For a frequency distribution M.D from mean is completed by _____________

A)?x/n
B)?fx/n
C)?fIdI/n
D)None of these

Question 12

The mean duration of the series : a,a+d,a+2d,………,a+2n from its mean is

A)n(n-1)
B)n(n-1)/2
C)n(n+1)/2
D)n(n+1)d/2n+1

Question 13

Find the sum of the duration of the variable values 3,4,6,8,14 from their mean

A)3
B)4
C)8
D)7

Question 14

The varience of 15 observations is 4, if each observation is increased by 9, the varience of the resulting observation is

A)8
B)16
C)4
D)None of these

Question 15

Find the value of third quartile if the values of first quartile and quartile deceiation are 104 & 108 respectively

A)120
B)70
C)110
D)140

Question 16

Mean deceiation which is calculatedis

A)Mean
B)Median
C)Mode
D)None of these

Question 17

Find the probable error if r=0.6 and n=64

A)0.8
B)0.7
C)64
D)0.43

Question 18

Maximum positive value of coefficient of correlation is ___________-

A)0
B)1
C)2
D)None of these

Question 19

If correlation coefficient r is -ve, both the regression coefficients are ____________

A)+ ve
B)0
C)- ve
D)None of these

Question 20

When the values of two variables change in the same direction, there is _________correlation

A)+ ve
B)- ve
C)Perfect
D)None of these

Question 21

A time series consists of

A)two components
B)three components
C)four components
D)none of the above

Question 22

The forecarts on the bacis of a time series are

A)Cent per unit time
B)true to great extent
C)Never true
D)True to some extend

Question 23

The component of a time series attached to long term variations is termed as:

A)cyclic variation
B)secula
C)irregular variation
D)all the above

Question 24

The component of a time series which is attached to short term fluctuations is

A)seasonal variation
B)cyclic variation
C)irregular variatio
D)allthe above

Question 25

A lock-out in a factory for a month is associated with the component of a time series is :

A)irregular movement
B)secular trend
C)cyclic variation
D)none of these