The following table shows the annual returns (in percent) for the Fidelity Utilities fund from 2006 through 2010. 
a. Calculate the point estimate of σ2.
B) Construct a 95% confidence interval of σ2.
Definitions:
Immune System Efficiency
The effectiveness with which the immune system identifies, responds to, and eliminates pathogens and foreign substances.
Organ Transplants
Medical procedures in which an organ is removed from one body and placed in the body of a recipient, to replace a damaged or missing organ.
Cancer
A group of diseases characterized by the uncontrolled growth and spread of abnormal cells.
Specific Immune Responses
Immune reactions that are tailored to recognize and combat specific pathogens or biological invaders.
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