Cough and Headache At the 98% confidence level, should be nurse inform the managers that their estimate of the proportion of common cold patients is incorrect? Yes. The observed sample proportion of patients with a common cold is higher than 15%. Yes, 15% is not a plausible proportion because it is not within the 98% confidence interval. No, 15% is within the 98% confidence interval, and it could be correct. No. The sample is random, and the observed proportion can be this high even when the actual proportion of common cold among patients is 15%.

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