The time it takes to complete a test was recorded for a sample of 15 students. The results follow. 
Use Excel to estimate the variance with a 90% level of confidence.
Definitions:
Respond Immediately
Acting or replying without delay.
Different Behaviors
Variations in actions or reactions of individuals or groups in different situations.
Cultures
The growth of microorganisms, cells, or tissues in a specially prepared nutrient environment for study or diagnosis.
Tolerant
The ability or willingness to tolerate the existence of opinions or behavior that one does not necessarily agree with.
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