A statistics teacher wants to see if there is any difference in the abilities of students enrolled in statistics today and those enrolled five years ago. A sample of final examination scores from students enrolled today and from students enrolled five years ago was taken. You are given the following information. 
The p-value for the difference between the two population means is
Definitions:
Delay Gratification
The ability to resist the temptation for an immediate reward and wait for a later reward.
Externality Hypothesis
A theory suggesting that individuals attribute their own behavior to external factors and circumstances beyond their control.
Homeostasis
The regulatory process by which biological systems tend to maintain stability while adjusting to conditions that are optimal for survival.
Overjustification Effect
The phenomenon where providing excessive external rewards for an already internally rewarding activity leads to a decrease in intrinsic motivation.
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