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...





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




▼



could not


could




have easily occurred by chance. It appears that there




▼



is


is not




sufficient evidence to conclude that 200 mg of caffeine does have an effect on memory.


b.

The probability shows that the sample results




▼



could


could not




have easily occurred by chance. It appears that there




▼



is


is not




sufficient evidence to conclude that the effects from the 300 mg treatment and the 200 mg treatment are different.




Jun 01, 2022
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