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Question: i need to know how to calculate the answers circled...

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I need to know how to calculate the answers circled.
The monthly sales for Yazici Batteries, Inc., were as follows: Month Jan Feb Mar Apr May Jun Jul Aug Sept Oct Nov Dec Sales 21 21 15 15 13 15 16 17 22 20 20 23 This exercise contains only parts b and c. b) The forecast for the next month (Jan) using the naive method number). 23 sales (round your response to a whole The forecast for the next period (Jan) using a 3-month moving average approach21 sales (round your response to two decimal places). The forecast for the next period (Jan) using a 6-month weighted average with weights of 0.10, 0.10, 0.10, 0.20, 0.20, and 0.30, where the heaviest weights are applied to the most recent month 20.4 sales (round your response to one decimal place). using exponential smoothing with α-Ο 35 and a September forecast of 18.00 t alar or the next period Jan- 20.82 sales (round your response to two decimal places). Using a method of trend projection, the forecast for the next month n) sales (round our response to two decimal places). c) The method (1) O a 3-month moving average that can be used for making a forecast for the mo h of March is (1) O a trend project O a 6-month weighted moving average O exponential smoothing O the naive method
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