1. Under what situations a treatment effect can be very large, and in some situations it can be very small. Suppose a sample of n = 16 individuals is chosen from population with mean of µ = 70. Treatment is handelled to sample and, after treatment, sample mean is found to be M = 76. Notice that treatment appears to have increased scores by average of 6 points.

a) If population standard deviation is σ = 20 is effect large adequate to be statistically significant? Use two - tailed test with α = .05
b) If population standard deviation is σ = 8 is effect large adequate to be statistically significant? Use two - tailed effect with α = .05