Student T test

One Sample Student’s T test 

Use: To compare a population mean inferred from a sample with a hypothetical population mean (derived from the literature or otherwise set by the investigator) 

Examples: Is the average weight of the laptops being produced weigh the same as the five-pound sample? 

Two Independent Sample Student T test 

Use: Used to compare two independent population means inferred from two samples. (No correlation between corresponding values). 

Examples: Is there a difference in individuals taking drug A verses individuals taking drug B? 

Two Dependent Sample Student T test 

Use: Used to compare two dependent populations inferred from two samples. (There is a correlation between corresponding values) 

Examples: (Data always needs to be related) Is there a difference between the amount of time Seals look for predators at the beginning of a haul out compared to the end of a haul out.