Monthly sales data

Month Sales

Jan$-21819$

Feb$-21839$

Mar$-211384$

Apr$-211473$

May$-211399$

Jun$-211837$

Jul$-212101$

Aug$-211918$

Sep$-211497$

Oct$-211610$

Nov$-211048$

Dec$-21963$

Jan$-22963$

Feb$-221000$

Mar$-221772$

Apr$-221768$

May$-221708$

Jun$-222590$

Jul$-222246$

Aug$-222491$

Sep$-221867$

Oct$-221855$

Nov$-221220$

Dec$-221289$

Jan$-231243$

Feb$-231235$

Mar$-231979$

Apr$-232098$

May$-232162$

Jun$-232757$

Jul$-232918$

Aug$-232915$

Sep$-232115$

Oct$-232353$

Nov$-231465$

Dec$-231524$

Jan$-24$

Feb$-24$

Mar$-24$

Apr$-24$

May$-24$

Jun$-24$

Jul$-24$

Aug$-24$

Sep$-24$

Oct$-24$

Nov$-24$

Dec$-24$

Case$1$:

Use the monthly sales data in Case $1$ to answer the following questions. $($Calculate to three decimal places$)$

a$.$ Plot the data.

b$.$ Explain why the seasonal with trend model is appropriate for forecasting.

c$.$What is the forecast for June $2024$ using the seasonal with trend model?

d$.$ Prepare a line graph to compare the forecast to the original data.