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    Time series forecast. Probability of forecasted value exceeding a threshold value?

    OK. Let's say that I have several years of monthly sales data. How would I go about finding the probability that monthly sales, three months in the future, will exceed a threshold value? Is this something that's commonly done? I spent some time searching on the internet for this, but haven't...
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    Generating confidence intervals for both height and weight with the same sample?

    Given that height and weight tend to be correlated, would it be okay for me to use a single simple random sample of people to create confidence intervals for both their height and their weight?