Practice question #9 This scatterplot gives data for 30 drivers, where x is the driver’s age and y is how far they can see in feet. Answer the following questions about the relationship. a. Do you expect the correlation coefficient r to be a positive or a negative value? _________________ b. Given that r2 = .64, fill in the following: This means that ___________ % of the ________________________ in “Distance” is explained by the ____________________________ relationship between “Age” and “Distance.” c. Based on the above parts, what value do you expect r to be? _________________________ d. The equation for the line of best fit is y = −3.0x + 576.7, which is included on the graph. Approximately what distance in feet would you expect a 50-year old driver to see? e. Would it be appropriate to use our line of best fit to make a prediction about the distance seen by a 110 year old? ____________________ Doing so would be an example of what statistical concept? __________________________
Practice question #9
This
a. Do you expect the
b. Given that r2 = .64, fill in the following: This means that ___________ % of the ________________________ in “Distance” is explained by the ____________________________ relationship between “Age” and “Distance.”
c. Based on the above parts, what value do you expect r to be? _________________________
d. The equation for the line of best fit is y = −3.0x + 576.7, which is included on the graph. Approximately what distance in feet would you expect a 50-year old driver to see?
e. Would it be appropriate to use our line of best fit to make a prediction about the distance seen by a 110 year old? ____________________
Doing so would be an example of what statistical concept? __________________________
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