What percentage of hospitals provide at least some charity care? Based on a random sample of hospital reports from eastern states, the following information is obtained (units in percentage of hospitals providing at least some charity care): 57.5 56.5 52.9 65.5 59.0 64.7 70.1 64.7 53.5 78.2   Assume that the population of x values has an appr

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What percentage of hospitals provide at least some charity care? Based on a random sample of hospital reports from eastern states, the following information is obtained (units in percentage of hospitals providing at least some charity care):
57.5 56.5 52.9 65.5 59.0 64.7 70.1 64.7 53.5 78.2
 
Assume that the population of x values has an approximately normal distribution.
 
(a) Use a calculator with mean and sample standard deviation keys to find the sample mean percentage x and the sample standard deviation s. (Round your answers to four decimal places.)
 
x= _____%
s= _____%
 
 
(b) Find a 90% confidence interval for the population average ? of the percentage of hospitals providing at least some charity care. (Round your answers to one decimal place.)
 
lower limit ______%
upper limit ______%
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