I have a question of Var and Mean of two independent populations:
Say we have RV owners and Boat owners and assume they are independent. If given Mean and Var of each (so 4 data points) but not how they are distributed - i.e we do not know how many Boat or RV owners are there nor the sum total. Under what conditions could we calculate a Mean and a Var for the combined group and calculate probabilities via Normal Table ? Is being independent enough ? Could we aggregate the Means and Var together ?
This seems like a basic level questions but I do not get it - or atleast would like to know how you would do - this question probably falls under aggregate Mean/Var portion.
Thanks for your suggestions - :)
Say we have RV owners and Boat owners and assume they are independent. If given Mean and Var of each (so 4 data points) but not how they are distributed - i.e we do not know how many Boat or RV owners are there nor the sum total. Under what conditions could we calculate a Mean and a Var for the combined group and calculate probabilities via Normal Table ? Is being independent enough ? Could we aggregate the Means and Var together ?
This seems like a basic level questions but I do not get it - or atleast would like to know how you would do - this question probably falls under aggregate Mean/Var portion.
Thanks for your suggestions - :)
How to mix two sets of Probabilities
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