The data below represent the means from 15 sample control charts for the amount of time in minutes it takes students to complete a quiz in a basic statistics course.The same quiz was given to 15 different sections of a basic statistics course.Five students were sampled from each class and each mean is shown below. 
Which graph is the control chart for 
?
Definitions:
Hard Work
A consistent effort or diligence in accomplishing a task or achieving a goal.
Recalled Memory
A memory that has been brought back to mind or consciously remembered.
Sickly Child
A child who experiences frequent health problems or is in poor health over an extended period.
Severe Symptoms
Intense or serious signs or indications of a disease, disorder, or condition.
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