An experiment was conducted to test the effect of a new stain remover. Twenty stains were treated with stain remover A and stain remover B for a week, then the number of stains removed was measured. Asignificance test was conducted at the a = 0.10 level for the difference in the means of the number of stains removed between stain remover A and stain remover B. The test resulted in t = 1.37 and p = 0.17. If thealternative hypothesis in question is Ha: HA - HB #0, where μA equals the mean number of stains removed with stain remover A and μg equals the mean number of stains removed with stain remover B, whatconclusion can be drawn?O There is a significant difference in the mean effectiveness of two stain removers.O There is sufficient evidence that stain remover A works better than stain remover B.O The proportion of stains that stain remover A removed is greater than the proportion of stains removed by stain remover B.O There is insufficient evidence that the proportion of stains removed by stain remover A and stain remover B is different.O There is insufficient evidence that there is a difference in the mean effectiveness of stain remover A and the mean effectiveness of stain remover B.

Step 1: Determine the appropriate decision for this hypothesis testDecision Rule: Reject the null…

Answered: An experiment was conducted to test the…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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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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a researcher uses a sample of n=25 individuals to evaluate the effect of a treatment. the hypothesis test uses a=0.05 and produces a significant result with t=2.15. how would this result be reported in the literature?
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