Following data are given for marks in subject A and B in a certain examination :
SUBJECT A ( MEAN MARKS 36, STANDARD DEVIATION 11 )
SUBJECT B ( MEAN MARKS 85, STANDARD DEVIATION 8 )
Coefficient of correlation between A and B = ±0.66
i) Determine the two equations of regression
ii) Calculate the expected marks in A corresponding to 75 marks obtained in B.

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Answers

  • Brainly User
2015-03-07T12:11:16+05:30
Q.1>Following data are given for marks in subject A and B in a certain examination :
SUBJECT A SUBJECT B
MEAN MARKS 36 85
STANDARD DEVIATION 11 8
Coefficient of correlation between A and B = ±0.66
i) Determine the two equations of regression
ii) Calculate the expected marks in A corresponding to 75 marks obtained in B.

Q2.> Construct 5- yearly moving averages from the following data
YEAR 2000 2001 2002 2003 2004 2005 200...
SALE 105 107 109 112 114 116 118 121 1...

Q 3.> In 120 throws of a single dice, following distribution of faces was observed.
FACES 1 2 3 4 5 6 TOTAL
F0 30 25 18 10 22 15 120
From the given data, verify that the hypothesis “dice is biased” is acceptable or 
not.
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