A random sample of 90 observations produced a sample mean of 25.9 and a sample standard deviation of 2.7. Which one of the following best approximates a 90% confidence interval for u? O 25.9 ± 0.56 O (25.43 , 26.37) O (23.2, 28.6) O 25.9 ± 5.4 cannot be determined from the data

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