Suppose you were to collect data for each pair of variables. You want to make a

Question

Suppose you were to collect data for each pair of variables. 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 and form. a) Cell phone bills: number of text messages, cost. b) Automobiles: Fuel efficiency (mpg), sales volume (number of autos). c) For each week: Ice cream cone sales, air conditioner sales. d) Product Price (5), number sold per day a) Cell phone bills: number of text messages, cost. Which variable would you use as the explanatory variable, and which as the response variable? Why? Fill in the blanks below The number of text messages is the explanatory variable, and cost is the res used to predict ponse variable, which are from number of text messages cost What would you expect to see in the scatterplot? Discuss the likely direction and form. Choose the correct answer below 0 A. The scatterplot will exhibit a positive direction and a curved form. O B. The scatterplot vwill exhibit a negative direction and a curved form ° C. The scatterplot will exhibit a positive direction and a linear form n The scatternint will exhibit nenative direction and a linear fnrm Click to select vour answer

Explanation / Answer

1) FOR CELL PHONE BILLS: THE SCATTER PLOT WILL EXHIBIT POSITIVE DIRECTION AND LINEAR FORM.

2) FUEL EFFICIENCY IS THE EXPLANATORY VARIABLE AND SALES VOLUME IS RESPONSE VARIABLE.

SALES VOLUMES ARE USED TO PREDICT FROM FUEL EFFICIENCY . THE SCATTERPLOT WILL EXHIBIT POSITIVE DIRECTION AND LINEAR FORM.

3) NEITHER VARIABLE IS EXPLANATORY VARIABLE. BOTH ARE RESPONSES TO THE LURKING VARIABLE OF TEMPERATURE.

4) PRICE AS EXPLANATORY VARIABLE AND NUMBER SOLD PER DAY IS RESPONSE VARIABLE. PREDICT NUMBER SOLD FROM PRICE OF THE PRODUCT .

THE SCATTERPLOT WILL EXHIBIT NEGATIVE DIRECTION CURVED FORM IN A LOWER RANGE AND BUT A LINEAR FORM OVER A LARGE RANGE OF PRICES.

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