An air conditioning repair company has developed a regression model for predicting the time it will take to perform a re

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An air conditioning repair company has developed a regression
model for predicting the time it will take to perform a repair. The
estimated regression equation is:
y-hat = 1.86 + 0.29(x1) +
1.10(x2) - 0.61(x3)
where: y = Repair time (hours)
x1 =
Months since last maintenance service
x2 = 0
if repair is mechanical; x2 = 1 if repair is
electrical
x3 = 0
if repair is done by Bob; x3 = 1 if repair is
done by Dave
Referring to the regression equation above, the correct
interpretation of b1 is:
Group of answer choices
For each additional month since the last maintenance service,
repair time is expected to increase by .29 hours.
For each additional hour of repair time, the expected time since
the last maintenance service will increase by 0.29 months.
For each additional month since the last maintenance service,
repair time is expected to increase by 29 minutes.
Repair time will be .29 hours if the last maintenance service
was a month ago.