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18.

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24.

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Which of the following components may be ignored when a time series data is collected on
an annual basis ?
(೩) Trend (8) Seasonal (C) യഃ (D) ஷய

Crude birth rates are calculated by dividing the births during a year by :
(ക) Mid - year population for that year

(ठ) End - year population for that year

(0) Population at the beginning of the year

(D) None of these

The chart suitable to represent the data on blood donation of O, A, B and AB blood groups
by the students in a college during the last four years is :
(A) pie chart (8) histogram
(©) multiple bar diagram (D) cartogram

The average marks of boys in a class is 65 and that of girls is 70. The average of both the
groups combined is 67. Then the ratio of number of boys and girls is :
(8) 1:3 1 25 06۴ (D) 3:2

On fitting a bivariate linear regression model to a data set (n=10) it is found that the variance
of the dependent variable (based upon a division of n) is 8.5 and the residual sum of squares
is 17. Then the coefficient of determination (+?) of the fitted model 5 :

(A) 0.80 (8) 0.20 (ಲ) 0.50 (D) 025
Which average is suitable for finding the average of proportions ?

(५) Arithmetic mean (ठ) Median

(C) Mode (D) Geometric mean

Which of the following statements is false if multicollinearity is present ?

(ക) There occurs several models which include different sets of explanatory variables
consonant with the data.

(B) There can be no clear cut interpretation of the regression coefficients as measures വ്‌
marginal effects.

(ര The regression coefficients may be unstable

(D) The OLS estimates of regression coefficients are no longer unbiased.

71. 22, ~3 ग्ट the quartiles, then which of the following holds for a positively skewed
data ?

A) Q-Q>Q B © +>20 (09 ൮൦ Q;>Q () ल + > 2

The null hypothesis of Durbin - Watson test for auto correlation 15 :

(A) random component of the regression model 15 independently and normally distributed
(8) random component of the regression model is dependent and normally distributed
(C) there is one period dependence between successive values of the random component
(D) None of these

5 160/2015
{P.T.0.} ‏ض‎