In particular, is the estimated standard error calculated by the square root of the variance or the square root of the variance/n or the square root/n-1?
A sample is selected from a population with µ = 150. After a treatment is administered to the individuals, the sample mean is found to be M = 145 and the variance equal to 100.
a. If the sample has n = 4 scores, then calculate the estimated standard error and determine whether the sample is sufficient to conclude that the treatment has a significant effect? Use a two-tailed test with ? = .05.
b. If the sample has n = 25 scores, then calculate the estimated standard error and determine whether the sample is sufficient to conclude that the treatment has a significant effect? Use a two-tailed test with ? = .05.
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