Current Attempt in Progress Take a random sample of 40 of these hospitals using a systematic sample of every 50th hospital, starting with hospital 1. Using the sample and assuming that the population standard deviation of beds is 150, construct a 95% confidence interval to estimate the mean number of beds for a hospital in the United States. American Hospital Association database Sample mean (Round answers to 1 decimal place, e.g. 15.2.) Confidence interval (Round z values and final answers to 2 decimal SUS places, e.g. 15.25.)