Read$/$view file: Maintenance.csv

Your tire and auto business is considering the

purchase of a computer wheel alignment and

balancing machine. You believe the weekly usage

should predict maintenance expense and you

assume the SLR model. This file contains a random

sample of annual expense values $($in $$100$s$)$ and

corresponding weekly usage values in hours. Last

lesson we conducted a model utility test and found

evidence of a linear relationship between the

variables.

a$)$ Make statements about the plausibility of the

random error term assumptions for this data.

b$)$ Find an appropriate interval estimate for the

annual maintenance expense amount for an

individual machine used $25$ hours per week.

c$)$ You decide to purchase the machine and you

expect to use it $25$ hours per week. If a

contract for full$-$maintenance coverage costs

$$2500$ per year, would you recommend

purchasing it$?$ Explain