The accompanying summary quantities resulted from a study in

The accompanying summary 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).

(a) 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.)


(b) Calculate 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?

Solution

The proportion if observed variation in total service time =(22268.06/16)*(1/100)=13.917% . (b):se=(2607.55/17)=12.385. And degrees of freedom is (n-1)=(17-1)=16.