Find the z value that corresponds to the given area. 
Definitions:
Nurses' Health Study
A long-term research project investigating the factors that influence women's health.
Correlational Research
A scientific research methodology that examines the relationship between two or more variables to determine if a correlation exists.
Causal Research
A type of investigation aimed at determining cause-and-effect relationships.
Power Analysis
A statistical method used to determine the smallest sample size needed to detect an effect of a given size with a certain degree of confidence.
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