Wind speed (mph) Power (Watts)


0 0

5 75

10 588

15 1980

20 4700

25 9190

30 15876





1 499.79 Calculate the slope of the linear regression (trend line) for the data.





2 -2866.93 Calculate the y-intercept of the linear regression (trend line) for the data.





3 positive Is the correlation positive or negative?





4 17124.5 Calculate the projected power production in Watts for a wind speed of 40 mph.





5 7.74 Calculate the wind speed for which power production is 1000 Watts.





6 0.9064 Determine the correlation coefficient r.





7 high or strong Is the correlation none, low, moderate, high, or perfect?





8 non-linear Does the relationship appear to be linear or non-linear?





9 0.8216 Determine the coefficient of determination.





10 82.16% What percent in the var in wind speed accounts for the var in the kilowatt hours?





11 Yes In this case, is there causation?






[ans will vary] Why or why not?