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

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?

2605.54 / 22218.07 =0.1173

(b) Calculate the value of the estimated standard deviation s_e

_{22218.07 / 2605.54 = 5.527}

What is the number of degrees of freedom associated with this estimate?

15-1=14