Looking at your regression output, was the relationship between $2014$ and $2015$ percentage of sales returned significant? How can you tell?

What are the drawbacks of using one year of data to forecast a future year?

Brainstorm at least four other data items $($e$.$g$.,$ economy, type of customer, etc.$)$ that would be helpful in predicting the next year$$s percentage of sales returned.

AQ$4.$ What have you learned from completing the analyses in Question Sets $1,2,$ and $3?$