In the following sample size formula,which level of confidence is being used? 
Definitions:
Systemic Lupus Erythematous
An autoimmune disease where the body's immune system mistakenly attacks healthy tissue, affecting the skin, joints, kidneys, brain, and other organs.
Anemia
A condition where there is a deficiency of red blood cells or hemoglobin in the blood, leading to symptoms like fatigue and weakness.
Leukopenia
A condition characterized by a decrease in the number of white blood cells in the blood, affecting the body's ability to fight infection.
Butterfly-Shaped Rash
A distinctive facial rash resembling the wings of a butterfly, commonly associated with the autoimmune disease lupus.
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