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1. Consider the following sales data for a local company. Year/Quarter 2019-Quarter 1 Sales 68 Year/Quarter 2020 Sales Quarter 3 350 2019 Quarter 2

1. Consider the following sales data for a local company. Year/Quarter 2019-Quarter 1 Sales 68 Year/Quarter 2020 Sales Quarter 3 350 2019 Quarter 2 75 2020 Quarter 4 45 2019 Quarter 3 218 2021 Quarter 1 83 2019 Quarter 4 2020 32 2021 Quarter 2 97 Quarter 1 2020-Quarter 2 72 85 2021 Quarter 3 2021 Quarter 4 374 52 (a) Let 2019 and 2020 be the training period and 2021 be the validation period. Find the seasonal nave forecasts for each quarter of 2021. (b) Based on your forecasts in part (a), calculate the errors for the validation period. (c) Calculate the RMSE (root mean squared error) for the validation period. (d) Assuming you are content with the forecasting or predictive accuracy of this model, find the seasonal nave forecasts for each quarter of 2022.

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