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Please help out ima fail out of control

Statistics
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The results of a common standardized test used in psychology research is designed so that the population mean is 140 and the standard deviation is 40. A subject earns a score of 72. What is thez-score for this raw score?

Dec 3rd, 2014

Again 

z=(y-mean)/SD=(72-140)/40=-1.7


Dec 3rd, 2014

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Dec 3rd, 2014
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Dec 3rd, 2014
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