Biostatistics Quiz
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A medical researcher is planning a study to estimate mean cholesterol levels with 95% confidence and margin of error ±5 mg/dL. Based on previous research, she estimates the population standard deviation as 25 mg/dL. After calculating the required sample size, she realizes that her budget allows for exactly 75 participants. To achieve her desired margin of error with this sample size, what confidence level should she use instead?
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