Consider the addFirst method of the LinkedList class in Chapter 16: 
Definitions:
Observations
Refers to the individual data points or recorded measures of variables collected in a study.
Confidence Interval
A range of values, derived from sample statistics, that is likely to contain the value of an unknown population parameter at a given confidence level.
Standard Deviation
A measure of the amount of variation or dispersion of a set of values, used in statistics to quantify the spread of data points.
Service Times
Refer to the duration it takes to complete a service for a customer or process a task.
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