(a) Since, the p-value is less than the level of significance if considered 0.05, reject the null hypothesis Ho.
Sleep group had better recall ability.
Yes, I do think that Sleep is really better than caffeine for recall ability because of higher mean.
(b) Since, the p-value is greater than the level of significance 5% or 0.05, we do not reject the null hypothesis Ho.
If the significance is 10%, the p-value is less than the level of significance 10% or 0.10, we reject the null hypothesis Ho.
There evidence of difference of mean recall ability between these two groups is not strong.
(c) Since, the p-value is greater than the level of significance 5% or 0.05, we do not reject the null hypothesis Ho.
Caffeine group had better recall ability.
Yes, Caffeine impairs recall ability because it has low mean as compared with others.
(d) Take a nap
The consumption of caffeine to benefit alertness is a common activity practiced by 90% of adults...
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