Quiz 3

10. Suppose you were to collect data for each pair of variables listed below. You want to make a scatterplot. Which variable would you use as the explanatory variable and which as the response​ variable? Why? What would you expect to see in the​ scatterplot? Discuss the likely​ direction, form, and strength.

​a) Cell phone data plans for a person who wants a large file​ size: file​ size, cost

​b) Lightning strikes by a person watching a lightning​ storm: distance from​ lightning, time delay of the thunder

​c) A streetlight that you are​ approaching: its apparent​ brightness, your distance from it

​d) Cars being catalogued at a​ dealership: weight of​ car, age of owner

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a) The explanatory variable would be ______ and the response variable would be _______ because

file size could be used to predict cost.  The scatterplot would likely show an association that is ______ and ___________

b) The explanatory variable would be _______ and the response variable would be ________ because

the time delay could be used to predict the distance.  The scatterplot would likely show an association that is _______ and _______________

​c) The explanatory variable would be ______________ and the response variable would be __________ because

apparent brightness could be used to predict distance.  The scatterplot would likely show an association that is ______ and _____________

​d) The explanatory variable could be the weight of the car and the response variable could be the age of the owner because either variable could be used to predict the other. The scatterplot would likely show an association that is ___________ and ________