the costello Music company has been in business for five years. during that time, salesof pianos increased from 12 units in the first year to 76 units in the most recent year. Fredcostello, the firm’s owner, wants to develop a forecast of piano sales for the coming year.the historical data follow.Year 1 2 3 4 5Sales 12 28 34 50 76a. construct a time series plot. What type of pattern exists in the data?b. develop the linear trend equation for the time series. What is the average increase insales that the firm has been realizing per year?c. Forecast sales for years 6 and 7.

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
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Chapter4: Equations Of Linear Functions
Section4.5: Correlation And Causation
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the costello Music company has been in business for five years. during that time, sales
of pianos increased from 12 units in the first year to 76 units in the most recent year. Fred
costello, the firm’s owner, wants to develop a forecast of piano sales for the coming year.
the historical data follow.
Year 1 2 3 4 5
Sales 12 28 34 50 76
a. construct a time series plot. What type of pattern exists in the data?
b. develop the linear trend equation for the time series. What is the average increase in
sales that the firm has been realizing per year?
c. Forecast sales for years 6 and 7.

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