A colleague went to the website in February 2014
and recorded the number of pieces and the sales price for 157 Lego products
listed there. The data appear in the Legos data fi le.

a. Which variable do you think makes more sense to use as
the explanatory variable and which as the response variable?

 b. Enter the data into the Carr/Regression applet. Produce
a scatterplot and comment on the association between the variables as revealed
in the scatterplot. (Remember to comment on form, direction, strength, and
unusual observations.)

 c. Report the value of the correlation coefficient.

d. Calculate the value of r 2 and interpret what the value
means in this context.

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