ch 14 - independent sample t test · ch 14 - independent sample t test.pptx author: kevin dooley...
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Homework ch. 14 • Does consuming caffeine increase perceived a:ractiveness of others? A group of people are given a cup of coffee and asked to rate random pictures from 1-‐‑10 (mean rating = 7.5, s = 4, n = 36); another group is given decaf coffee and follows the same procedure (mean = 6.0, s = 3, n = 36).
1. State the null hypothesis
2. Calculate t observed and find t critical
3. What is your decision and interpretation/conclusion
4. Find a 99% confidence interval for the difference in perceived a:ractiveness of others between subjects who do or don’t consume caffeine