(Answered) Question nelson industries manufactures a part for a type

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Question: Nelson Industries manufactures a part for a type of aircraft engine that is becoming obsolete. The sales history for the last 10 years is as follows:

a. Plot sales versus time.

b. Estimate the regression model for a linear time trend of sales.

c. What is the root-mean-squared error of the linear regression estimates for these 10 years?

d. Using this model, estimate sales for year 11.

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