Problem $18-29($Algo$)$

The new productions manager for Speakers and Company, needs to find out which variable most affects the demand for the

company's line of Bluetooth speakers. The manager is uncertain whether the unit price of the product or the effects of increased

marketing are the main drivers in sales and wants to use regression analysis to figure out which factor drives more demand for its

particular market. Pertinent information was collected by an extensive marketing project that lasted over the past $12$ years $($year $1$ is

data from $12$ years ago$)$ and was reduced to the data that follow.

a$.$ Perform a regression analysis based on these data using Excel.

Note: Negative values should be indicated by a minus sign. Round your answers to $4$ decimal places.

c$.$ Predict average yearly speaker sales for Speakers and Company based on the regression results if the price was $$299$ per unit and

the amount spent on advertising $($in thousands$)$ was $$890.$

Note: Enter your answer in thousands. Do not round intermediate calculations. Round your answer to the nearest whole number.