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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.
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How much time a train 120 metres long running at the speed of 36 km/hr will take to cross a bridge 130 metres in length?
A train travels from A to B at a speed of 60 km/h, and then from B to C at a speed of 80 km/h. The total distance covered from A to C is 240 km, and the...
Two trains X and Y start at the same time in the opposite direction from two points P and Q and arrive at their destinations 25 and 16 hours respectivel...
‘A’ and ‘B’ started moving towards each other at same time with a speed of 20 km/hr and 15 km/hr, respectively. If the di...
The speed of a bike increases by 5 km/hr after every 1 hour. If the distance travelled by the bike in 1st hour is 10 km, the find the total distance tra...
A and B are travelling towards each other with a speed of 30 km/hr and 40 km/hr. They started at same time and A covered 25 km less distance than B befo...
Ram needs to travel from point A to point B. If he travels at a speed of 24 km/h, he arrives 2.5 hours later than expected. On the other hand, if he in...
The ratio of the speed of car to that of a train is 15:22. If the speed of the train is 35 Km/hr more than that of the car, what is the speed of the car?