Suppose a study was done to determine if the average amount of sleep that students get the day before an exam is less than 6 hours.An SRS of 100 students from a university was taken and a mean of 5.5 hours was computed from the sample.The figure below provides the results of the analysis. 
What is the null hypothesis?
Definitions:
Elaborative Rehearsal
A memory technique that involves thinking about the meaning of the term to be remembered, rather than merely repeating the word to yourself.
Mental Image
A representation of sensory experience that occurs in the absence of direct external stimuli, often visual or auditory in nature.
Memory Strategy
Techniques or methods employed to enhance memory and recall, including mnemonics, chunking, and rehearsal.
Elaborative Rehearsal
A technique in memory strategies involving the linking of new information to existing knowledge through deeper cognitive processing.
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