Refer to Copier maintenance Problem 1.20. The users of the copiers are either training institutions that use a small model, or business firms that use a large, commercial modeL An analyst at Tri-City wishes to fit a regression model including both number of copiers serviced (XI) and type of copier (X2 ) as predictor variables and estimate the effect of copier model (S-small, L-large) on number of minutes spent on the service call. Records show that the models serviced in the 45 calls were

i think the answer is b.

step-by-step explanation:

not 100% sure though.

option a is correct.

step-by-step explanation:

scale factor: it is used to find proportional measurements.

proportions means having the same ratio.

scale factor is the ratio of the model measurement to the actual measurement in a simplest form.

or we can say that the ratio of any two corresponding lengths in two similar geometric figures

if the scale factor is more than 1, then it is an enlargement,

if the scale factor less than 1, then it is a reduction.

given the two geometric figure:

by definition of proportions, we have