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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.
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