4. What percentage of hospitals provide at least some charity care? Based on a r
ID: 3431222 • Letter: 4
Question
4. 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.)
(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.)
5. The price of a share of stock divided by the company's estimated future earnings per share is called the P/E ratio. High P/E ratios usually indicate "growth" stocks, or maybe stocks that are simply overpriced. Low P/E ratios indicate "value" stocks or bargain stocks. A random sample of 51 of the largest companies in the United States gave the following P/E ratios
57.3 56 52.8 66.3 59.0 64.7 70.1 64.7 53.5 78.2Explanation / Answer
(4)(a) mean=62.3
s=8.1
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(b)
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(5)(a) mean=25.2
s=15.5
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(b)
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(c)
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(d)
We can say Bank One is below average, AT&T Wireless is above average, and Disney is below average.
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(e)Yes. According to the central limit theorem, when n ? 30, the x distribution is approximately normal.
57.6 confidence interval 90.% lower 66.9 confidence interval 90.% upper 4.6712 margin of errorRelated Questions
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