5. [-/4 Points] DETAILS BBBASICSTAT8 8.2.018.MI.S. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER 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): 56.7 55.7 53.1 66.5 59.0 64,7 70.1 64.7 53.5 78.2 USE SALT 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 = 1% S = 1% (b) Find a 90% confidence interval for the population average u of the percentage of hospitals providing at least some charity care. (Round your answers to one decimal place.) lower limit % upper limit 1% Need Help? Read it Master It 6. [-/4 Points] DETAILS BBBASICSTAT8 8.2.016.S. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Do you want to own your own candy store? Wow! With some interest in running your own business and a decent credit rating, you can probably get a bank loan on startup costs for franchises such as Candy Express, The Fudge Company, Karmel Corn, and Rocky Mountain Chocolate Factory. Startup costs (in thousands of dollars) for a random sample of candy stores are given below. Assume that the population of x values has an approximately normal distribution. 91 176 128 98 75 94 116 100 85 USE SALT (a) Use a calculator with mean and sample standard deviation keys to find the sample mean startup cost x and sample standard deviation s. (Round your answers to four decimal places.) X = thousand dollars S = thousand dollars (b) Find a 90% confidence interval for the population average startup costs u for candy store franchises. (Round your answers to one decimal place.) lower limit thousand dollars upper limit thousand dollars Need Help? Read It Watch It8. [-/2 Points] DETAILS BBBASICSTAT8 8.2.001.EP.S. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER What are the degrees of freedom for Student's t distribution when the sample size is 24? d.f. = Use the Student's t distribution to find to for a 0.95 confidence level when the sample is 24. (Round your answer to three decimal places.) LA USE SALT Need Help? Read It Watch It 9. [-/1 Points] DETAILS BBBASICSTAT8 8.1.016.MI. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Overproduction of uric acid in the body can be an indication of cell breakdown. This may be an advance indication of illness such as gout, leukemia, or lymphoma. Over a period of months, an adult male patient has taken fifteen blood tests for uric acid. The mean concentration was x = 5.26 mg/dl. The distribution of uric acid in healthy adult males can be assumed to be normal, with o = 1.95 mg/dl. (a) Find a 95% confidence interval for the population mean concentration of uric acid in this patient's blood. What is the margin of error? (Round your answers to two decimal places.) lower limit upper limit margin of error (b) What conditions are necessary for your calculations? (Select all that apply.) O . is known O uniform distribution of uric acid O normal distribution of uric acid O o is unknown O n is large (c) Interpret your results in the context of this problem. O We are 95% confident that the true uric acid level for this patient falls within this interval. O We are 5% confident that the true uric acid level for this patient falls within this interval. O The probability that this interval contains the true average uric acid level for this patient is 0.05. The probability that this interval contains the true average uric acid level for this patient is 0.95. (d) Find the sample size necessary for a 95% confidence level with maximal margin of error E = 1.08 for the mean concentration of uric acid in this patient's blood. (Round your answer up to the nearest whole number.) blood tests Need Help? Read It Master It