Old Exam Papers Dec. 2010 - Video

9. (a) From the following data, estimate the yield when
rainfall is 9 inches :
Mean S.D.
Yield of wheat
(kg per unit area) 10 8
Annual rainfall (inches) 8 2
Coefficient of correlation 0.5
(b) From the following data, compute coefficient of
correlation between X and Y :
X Y
Series Series
Arithmetic mean 25 18
Squares of deviation from
Arithmetic mean 136 138
Summation of products of
deviation of X and Y, series
from their respective means 122
Number of pairs observed 15
700 4 MS-08
Papers (A) (December) 2010
(221)
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7
6. Indicate the difference between decision under risk and
uncertainty in statistical decision theory. 14
7. Explain the assumptions in large sample theory.Distinguish
clearly between large sample and small sample test of
significance. Are small sample tests valid for large
samples ? Explain. 14
8. (a) In an experiment on immunization of cattle from
tuberculosis the following results were
obtained :
Died or Unaffected
affected
Inoculated 12 26
Not inoculated 16 6
Determine the effect of vaccine in controlling
susceptibility to tuberculosis. 7
(b) 500 apples are taken at random from a large
consignment and 50 are found to be bad. Estimate
the percentage of bad apples in the consignment
and assign limits with in the percentage probably
lies. 7
MS-08 3 PTO