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Q1) Test effectiveness of a treatment, a sample of n=25 people is selected from normal population with a mean of μ=60. After treatment is administered to individuals in sample, the sample mean is found to be M = 55.
a) If population standard deviation is σ=10, can you conclude that treatment has significant effect? Use two-tailed test with α = 0.05.
b) If population standard deviation is σ=20, can you conclude that treatment has a significant effect? Use two-tailed test with α = 0.05.
c) Calculate Cohen's d to measure effect size for both tests (σ=20 and σ=10).
d) Briefly explain how the standard deviation influences outcome of hypothesis test. How does σ influence measures of effect size?
Evolutionary theories often, Emphasize that humans have adapted to their physical environment. One such theory hypothesis that:
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