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A researcher believes that a new treatment will decrease scores. A random sample is selected from...

A researcher believes that a new treatment will decrease scores. A random sample is selected from a normal population with μ = 60 and σ = 15. After a treatment is administered to 25 individuals in the sample, the sample mean is found to be M = 57. Did the treatment significantly decrease scores? (13 points)

A. IV

DV

B. Inferential proof with the 7 steps.


Math   Statistics-And-Probability   
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