A random sample of 25 individuals is selected from a population that is known to have a mean of 20. A treatment is administered to the sample, and they are found to have a mean of 22.2 and a Sum of Squares (SS) of 384. Using the t-test at an alpha level of .05, please determine whether the treatment has a significant effect.  Please show all 5 steps of hypothesis testing.  

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Step 1 Declare a null hypothesis Declare a null hypothesis which states that 20 is the actual mean o... View the full answer