Question sheet

Question sheet - Question sheet; 1. In the / N for the mean...

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Question sheet; 1. In the σ / √ N for the mean control chart, will the σ be given? Because when I tried to find the σ for the mean of the means aka the x barbar, I could never get the same value as in the example in class. 2. For the seasonal component of the multiplicative model: = [(spring 06/mean06) +(spring 07/mean 07)] / 2, will we ever use 3 years and divide by 3? Or will forecasting be based on just 2 years? The reason I ask:
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