Consider the data set of the times taken to unload a truck at a warehouse given in DS 12.2.2.
(a) What is the standard error of β1?
(b) Construct a two-sided 90% confidence interval for the slope parameter β1.
(c)Test the null hypothesis H0: β1 = 0.
(d) Does your analysis indicate that there is evidence that the trucks take longer to unload when the temperature is higher? Can a case be made that the installation of air-conditioning will improve worker efficiency?