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What percentage of hospitals provide at least some charity care? Based on a random sample of...

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Basic Math

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 ofhospitals providing at least some charity care):

57.2 56.1 53.1 65.8 59.0 64.7 70.1 64.7 53.5 78.2

Assume that the population of x values has an approximatelynormal distribution.

(a) Use a calculator with mean and sample standard deviationkeys to find the sample mean percentage x and the sample standarddeviation s. (Round your answers to one decimal place.)

x = %

s = %

(b) Find a 90% confidence interval for the population average μof the percentage of hospitals providing at least some charitycare. (Round your answers to one decimal place.)

lower limit %

upper limit %

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