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If the regression coefficients are both 0 then r is 0. The reasoning for either one of them being 0 holds true mathematically but in the econometrics sense, rxy = 0, means that there is no linear relationship between x and y as covariance is 0; so one of the regression coefficient being non-zero would indicate existence of a relationship between the two variables. Hence, option c is the most appropriate one.
Average 20 numbers is ‘x’. If the average of first 12 numbers is 72.5 while average of last 5 numbers is 86.8 and 13th, 14th a...
The average weight of five friends A, B, C, D and E is (x+8) years while the average weight of C and E is (x-8) kg. If the weight of another person F is...
The average number of books on history, polity and geography in a library is 140, and the average number of books on history and geography is 150. If th...
Average of 8 numbers is 50. If average of first four and last two numbers is 40 and 35, respectively then find the fifth number given that ratio of fift...
The average number of taxis of three colours (black, white and yellow) in a taxi stand is 150. The number of black taxis is 50 more than that of yellow ...
Nora claims her age is between 18 and 22 years. Her grandmother says Nora's age is between 20 and 24 years. Her aunt thinks her age is between 19 and 21...
A person purchased diesel at Rs. 7, Rs. 10 and Rs. 12 per litre in three successive years. If he spent Rs. 2520 each year on diesel, then find the appro...
The average weight of A, B, C is 76 kg when D joins them the average weight becomes 70 kg. If E whose weight is 2 kg more than D replaces A, then the av...
A number is such that when it is multiplied by 3, it gives another number which is as much above from 240 as the original number (itself) is below 240. ...
The certain sum amounts to Rs11313.5 in 2(1/2) years at 12% p.a., interest compounded 10 months. The sum (in Rs) is:
