Question: Wanting to know if there is a linear relation among wind chill temperature, air temperature (in degrees Fahrenheit), and wind speed (in miles per hour),

Wanting to know if there is a linear relation among wind chill temperature, air temperature (in degrees Fahrenheit), and wind speed (in miles per hour), a researcher collected the following data for various days.
(a) Find the least-squares regression equation y̅ = b0 + b1x1 + b2x2, where x1 is air temperature, x2 is wind speed, and y is the response variable "wind chill."
(b) Draw residual plots to assess the adequacy of the model. What might you conclude based on the plot of residuals against wind speed?

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