The following time series shows the sales of a particular product over the past $12$ months.

Use the Na$$ve forecast method to get the forecasts for Month $2-12.$ Calculate the MAE, MSE, and MAPE.

$----$Details are required. Please print the paper sheet and have all your calculations on the paper sheet $($No Excel working sheet is accepted here$).$

Month Sales

$188$

$299$

$396$

$497$

$5108$

$6119$

$7120$

$8121$

$9100$

$1089$

$1188$

$1290$

b$.$ Use the $3-$month moving average forecast method to get the forecasts for Month $4-12.$ Calculate the MAE, MSE, and MAPE.

Month Sales

$188$

$299$

$396$

$497$

$5108$

$6119$

$7120$

$8121$

$9100$

$1089$

$1188$

$1290$

c$.$ Which approach do you think is better? Why?