What was the minimum dose of caffeine that the authors found to have an effect on memory performance? Question 28 options: 200mg 100mg 300mg 400mg 50mg
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A study on the enhancing effect of coffee on long-term memory found that 35 participants given $200 \mathrm{mg}$ of caffeine performed better on a memory test 24 hours later compared to the placebo group that received no caffeine. a. There was a probability of $0.049$ that the difference between the coffee group and the placebo group was due to chance. What do you conclude? b. A group given a higher dose of $300 \mathrm{mg}$ performed better than the $200 \mathrm{mg}$ group, with a probability of $0.75$ that this difference is due to chance. What do you conclude?
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23. Posttest 4 A researcher was interested in learning about the effect of caffeine consumption on problem solving. To examine this relationship, participants were randomly selected and assigned to one of four conditions: no caffeine consumption, 100 mg dosage of caffeine, 200 mg dosage of caffeine, or 300 mg dosage of caffeine. The participants were then asked to solve as many anagrams* as possible in a 5 minute period. The results of the study are presented below. *Anagrams are word puzzles that are solved by rearranging the letters so that each letter is used exactly once to create a new word, for example: No Eagle in Jail = Angelina Jolie or Balk Tables = Basketball. No Caffeine Group 3 7 4 4 3 8 8 4 4 7 1 5 3 8 5 6 100 mg Group 6 8 9 8 11 10 7 5 5 8 8 5 7 7 9 7 200 mg Group 3 11 6 6 5 8 6 6 8 8 6 9 7 8 9 6 300 mg Group 6 5 7 6 7 5 9 4 10 8 7 7 9 5 3 6 There is a significant difference between the 100 mg Group and the 200 mg Group. True False
Madhur L.
A physiological psychologist suspects that caffeine affects short-term memory. In order to test this idea, she administers a different dose of caffeine to each of three groups of participants. She then gives each group a short-term memory test and counts the number of errors made by each participant. The data (number of errors made by each participant) and intermediate values are shown below. Can the psychologist conclude that caffeine affects short-term memory? Provide a complete interpretation based on the evidence. Graph the data if appropriate. SHOW YOUR WORK. (10 pts) Control (0 mg) Low Dose (100 mg) High Dose (400 mg) 6 5 11 4 1 9 5 3 10
Adi S.
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