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Copy of Eco-friendly Coffee Cups

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Gabby Garza

on 1 May 2013

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Transcript of Copy of Eco-friendly Coffee Cups

Effects of Caffeine on Word-Search Task Performance
Conducted by Gabby Garza A Brewd Awakening Reason for Experiment Many of my college students consume caffeinated beverages before an academic evaluation or exam with the idea that it will improve their performance and increase their focus. Procedure Statistical Analysis Subjects:
n = 15 participants
n-Caff = 7
n-Decaf = 8

Average Scores of Words Found on Wordsearch: The Low Down on the Coffee Caffeinated Coffee:
Brazil Cerrando Coffee
135 mg of Caffeine Per Cup of Coffee
1.20 % of Caffeine per Bean Decaffeinated Equations Hypothesis Consumption of a tall (355 mL) cup of caffeinated coffee will enhance the students’ performance and increase the number of words found in a simple word search during a five-minute time period. Consumption of decaffeinated coffee with increase number of words found due to the placebo effect. Phase 1 1) Recruit 15 students willing to participate and inform them that they are not allowed to consume any caffeine at least 24 hours prior to the experiment
2) Provide each student with a numbered name badge (1-15) that will be used to identify their word search tests
3) Have the distributors pass out pens and the first word search (Ancient Greece) (face down)
4) Have the participants write down their specific number on the back of the word search in the top right corner
5) Allow the participants to flip over the test and give them 5 minutes to complete as much as they can Phase 2 6) Brew 2 batches of coffee and have the pourer label each cup ‘A’ or ‘B’ (A=Decaffeinated, B=Caffeinated) and fill them accordingly
7) Have the distributor (who does not know which cup is labeled ‘A’ or ‘B’) pass out the coffee
8) Allow the students 5-7 minutes to drink their coffee then wait 15 minutes to begin the experiment (research has shown caffeine is densest 15-45 minutes after consumption)
9) Tell the participants not to throw away their cup after they are done; just leave it on desk where they are sitting Phase 3 10) Have the distributors pass out pens and the second word search (Astronomy) (face down)
11) Again, have the participants write down their specific number on the back of the word search in the top right corner (it will be important for comparison)
12) Allow the participants flip over the test and give them 2 minutes to complete as much as they can
13) After the time is up, allow the participants to go but have them leave their completed word searches on the desk and have them place their coffee cup on top of it Phase 4 14) Have the distributors collect the word searches and mark each participants test with ‘A’ or ‘B' by looking on the bottom of their corresponding cup
15) Record the number of words found on each page
16) Compare each participant’s individual tests to one another to see if there was any significant difference or lack of change based on whether or not that individual had been given caffeinated or decaffeinated coffee
17) Compare the results of the caffeinated participants to those of the non-caffeinated participants Decaffeinated Coffee:
Decaf French Roast
6 mg of Caffeine Per Cup of Coffee Ancient Greece (1st Word-Search)
X-Caff = 8.43
X-Decaf = 7. 71
Astronomy (2nd Word-Search)
X-Caff = 11.14
X-Decaf = 11.42 Standard Deviation of Difference s = sqrt [ (sigma) ( xi - x )²/ ( n - 1 ) ] Standard Error for the Difference of Means sx= [((s)(xi))/ sqrt(n)] T-Test T= [xi/sx) Conclusion Outside Sources Standard Deviation of Difference s = 2.2520 Standard Error for Difference of Means sx = .8512 T- Test T = 4.4056 Results Caffeinated Standard Deviation of Difference s = 2.2254 Standard Error for Difference of Means sx =.8411 T-Test T= 4.2461 http://stattrek.com/descriptive-statistics/variability.aspx?tutorial=stat Degree of Freedom: 12 Critical Region: 2.179 Statistics: unplugged by Sally Caldwell (text) http://clearinghouse.missouriwestern.edu/manuscripts/204.php Significance Level = a < 0.05 Two-Tailed Test Degree of Freedom df = n1+ n2– 2 http://www.statstodo.com/TTest_Tab.php t > 2.179 Caffeinated: Decaffeinated: Degree of Freedom: 14 Critical Region: 2.145 t > 2.145 Because our calculated t values of 4.2461 (Caff.) & 4.4056 (Decaf.) fall within the above critical region of >2.179 (C) & 2.145 (D), the difference between the means of our two groups (caffeinated and non-caffeinated) is significant at the 0.05 level. Proving my hypothesis that caffeine increases performance and that coffee has the ability to act as a placebo. www.math.dartmouth.edu/archive/m5w04/public_html/files/Pr/CE.ppt http://www.energyfiend.com/the-caffeine-database Null Hypothesis: Caffeine will cause no difference in the tests Have you purchased coffee from one of these distributors in the last week? Or brewed your own? Average price of a cup of joe (According to FORBES) $1.38 per cup = $358 Annually At the end of your career = $14,000 Is it worth it the price? http://www.today.com/id/43828075/ns/today-money/t/little-splurges-cost-thousands-end/#.UYBHb8rCsf4 Examples of Words on the Wordserach Ancient Greece:
-Pelopennesian War
-Magneto Sphere
-Autumnal Equinox
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