Distance and time a car is being driven at an average speed, Ask an Expert

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Distance and Time A car is being driven at an average speed range of 50-70 kmph. The table shows distances between selected cities and the time taken by the car to cover these kilometers.

a. Calculate the correlation of the numbers shown in the part a table by using a computer or statistical calculator.

b. The table for part b shows the same information, except that the distance was converted to meters by multiplying the number of kilometers by 1000. What happens to the correlation when numbers are multiplied by a constant?

c. Suppose the 0.5 hour that is lost at toll booths is added to the hours during each travel, no matter how long the distance is. The table for part c shows the new data. What happens to the correlation when a constant is added to each number?

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