One sample of n = 12 scores has a mean of M = 7 and a second

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One sample of n = 12 scores has a mean of M = 7 and a second sample of n = 8 scores has a mean of M = 12. If the two samples are combined, what is the mean for the combined sample?
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Essentials Of Statistics For The Behavioral Sciences

ISBN: 9781133956570

8th Edition

Authors: Frederick J Gravetter, Larry B. Wallnau

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