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calculate z score when the mean difference is 1.28 and standard deviation is 1.5
Suppose that a sample of n =25 participants produced a mean difference of 1.28 points (self rated higher) with a standard deviation of s = 1.50 for the different scores. Is this result sufficient to conclude that there is a significant difference in the ratings for self versus others? Use a two—tailed testwith at α = .05
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