. Do the sample data support the conclusion that the Memory Booster has a significant "booster" effect? Test with α = .05. Hint: think about 1- or 2-tail test to use. 2. Compute Cohen's d and r2 to measure the treatment effect size.
A nutrition store in the mall is selling "Memory Booster" which is a concoction of herbs and minerals that is intended to improve memory performance. To test the effectiveness of the herbal mix, a researcher obtains a sample of n = 16 people and has each person take the suggested dosage each day for 4 weeks. At the end of the four-week period, each individual takes a standardized memory test. The scores from the sample produced a mean of M = 26 with a sample variance of s2 = 64. In the general population, the standardized test is known to have a mean of μ = 20.
1. Do the sample data support the conclusion that the Memory Booster has a significant "booster" effect? Test with α = .05. Hint: think about 1- or 2-tail test to use.
2. Compute Cohen's d and r2 to measure the treatment effect size.
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