Question
The accompanying sumary quantities resulted from a study in which x was the number of photocopy machines serviced during a routine service call and y was the total service time(min). What proportion of observed variation in total service time can be explained by a linear probabilistic relationship between total service time and the number of machines serviced? (Give the answer to three decimal places.) Claculate the value of the estimated standard deviation S_e^- (Give the answer to three decimal places.) s_e = What is the number of degrees of freedom associated with this estimate?
Explanation / Answer
a) proportion variation in total service time can be explained is 2609.54 / 22358.07 =0.1167 = 11.67%
b)
Se = srqt ( 2609.54 / 14 ) = 13.65
degree of freedom : 15 - 1= 14