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):
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 one decimal place.)
x bar = ? %
s = ? %
(b) Find a 90% confidence interval for the population average μ of the percentage of hospitals providing at least some charity care. (Round your answers to one decimal place.)
lower limit = ? %
upper limit + ? %
Create the following table.
|data||data-mean||(data - mean)2|
Find the sum of numbers in the last column to get.
So standard deviation is %
b. t value for 9 df is TINV(0.1,9)=1.8
So Margin of Error is
Hence CI is
So lower limit is 57.7%
Upper limit is 66.9%
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