Hi all, I have some summary statistics from a data set that look something like this:

Category------Color---------Avg Growth-------Std Error

Flowers--------Red-------------1.1--------------1.5

Flowers--------Blue------------2.4--------------1.5

Flowers--------Yellow----------5.1--------------1.4

Flowers--------All Colors-------2.9--------------0.8

What I would love to do is calculate/estimate the average growth and standard error of the combined set of Red and Yellow flowers. Ideally, I'd have access to the underlying dataset so I could calculate these measures directly, but I don't have access to the raw data.

Is there a way I can estimate the combined Avg Growth and Std Error of the Red and Yellow flowers?

Any advice is appreciated.

Thank you!

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