The following display from a TI-84 Plus calculator presents a 95% confidence interval for the mean difference between matched pairs. 
How many degrees of freedom are there?
Definitions:
Long-Term Memory
A type of memory capable of storing information for an extended period, ranging from days to a lifetime.
Hierarchical Structure
An organizational form that ranks each level in terms of importance or influence.
Choppy Impressions
Fragmented or discontinuous perceptions or understandings of a situation or experience.
Displace
In memory theory, to cause information to be lost from short-term memory by adding new information.
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