Question: The average hemoglobin reading for a sample of 20 nurses was 16 grams per 100 mL, with a sample standard deviation of 2 g. Assume

The average hemoglobin reading for a sample of 20 nurses was 16 grams per 100 mL, with a sample standard deviation of 2 g. Assume the hemoglobin readings are approximately normally distributed.Suppose we desire a 98% confidence interval for the true mean hemoglobin reading for nurses. The most appropriate reason among the following for using using the t-distribution is

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