Question

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):

56.5

56.1

53.3

66.4

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 one decimal place.)

x = ______ %

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 ___ %

Answer 1

(a)

Using calculator, the mean and standard deviation of sample is

(b)

Sample size: n = 10

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Answers: Lower limit = 57.6%

Upper limit = 67.0%