Use the given probability value to determine whether the sample results could easily occur by chance, then form a conclusion. A study on the enhancing effect of coffee on long-term memory found that 35 participants given 200 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 mg performed better than the 200 mg group, with a probability of 0.75 that this difference is due to chance. What do you conclude? . . . a. The probability shows that the sample results have easily occurred by chance. It appears that there sufficient evidence to conclude that 200 mg of caffeine does have an effect on memory. b. The probability shows that the sample results have easily occurred by chance. It appears that there sufficient evidence to conclude that the effects from the 300 mg treatment and the 200 mg treatment are different