[Solution Library] A random sample of n = 16 scores is obtained from a population with a mean of μ = 80, and a treatment is administered to the sample.


Question: A random sample of n = 16 scores is obtained from a population with a mean of μ = 80, and a treatment is administered to the sample. After treatment, the sample mean is found to be M = 82.

  1. Assuming the sample variance is s2 = 64, compute the estimated d and r2 to measure the size of the treatment effect.
  2. Assuming the sample variance is s2 = 1600, compute the estimated d and r2 to measure the size of the treatment effect.
  3. Comparing your answers from parts a and b, how does sample variance influence measures of effect size?

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