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 standard error of 
- 
is
Definitions:
Melatonin
Melatonin is a hormone produced by the pineal gland in the brain, involved in regulating sleep-wake cycles and signaling the body to prepare for sleep.
Testosterone
An androgen that is a key hormone in boys’ pubertal development.
Food Intake
The amount and type of food consumed by an individual or organism.
Estrogen
A group of sex hormones that play an essential role in the development and functioning of female sexual characteristics and the reproductive process.
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