Question 1

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

Accepted Answer

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

Question 2

The forecarts on the bacis of a time series are

Accepted Answer

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

Question 3

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

Accepted Answer

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

Question 4

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

Accepted Answer

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

Question 5

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

Accepted Answer

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

Question 6

Maximum positive value of coefficient of correlation is ___________-

Accepted Answer

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

Question 7

A time series consists of

Accepted Answer

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

Question 8

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

Accepted Answer

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

Question 9

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

Accepted Answer

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

Question 10

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

Accepted Answer

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

Question 11

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

Accepted Answer

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

Question 12

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 ____________________

Accepted Answer

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

Question 13

Variance= _______________

Accepted Answer

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

Question 14

Mean deceiation which is calculatedis

Accepted Answer

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

Question 15

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

Accepted Answer

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

Question 16

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

Accepted Answer

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

Question 17

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

Accepted Answer

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

Question 18

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

Accepted Answer

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

Question 19

Two types of ogives meet at ______________

Accepted Answer

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

Question 20

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

Accepted Answer

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

Exam 1: Statistical Analysis and Time Series Forecasting