Compute cohens d to measure effect size for both test , Ask an Expert

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To test the effectiveness of a treatment, a sample of n=25 people is selected from a normal population with a mean of 60. After the treatment is administered to the individuals in the sample, the sample mean is found to be M=55

a. Compute Cohen's d to measure effect size for both test ( standard deviation 20 and 10)

b. If the population standard deviation is 10, can you conclude that the treatment has a significant effect? Use a two-tailed test with .05

2. The value of z-score in a hypothesis test is influenced by a variety of factors. Assuming that all other variables are held constant, explain how the value of z is infuenced by each of the following

a. Increasing the difference between the sample mean and the original population mean.

b. Increasing the population standard deviation.

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Category:- Statistics and Probability
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