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# Confidence interval

mg/dl (b)Find a 99.9% confidence interval for the population mean of total calcium in this patient’s blood. (in mg/dl; round your answer to two decimal places.) lower limit mg/dl upper limit mg/dl Over the past several months, an adult patient has been treated for tetany (severe muscle spasms). This condition is associated with an average total calcium level below 6 mg/dl. Recently, the patient’s total calcium tests gave the following readings (in mg/dl). Assume that the population ofx values has an approximately normal distribution. 9.7 8.6 10.9 9.3 9.4 9.8 10.0 9.9 11.2 12.1 (a) Use a calculator with mean and sample standard deviation keys to ?nd the sample mean reading ; and the sample standard deviation 5. (in mg/dl; round your answers to two decimal places.) x = [ mg/dls = mg/dl (b) Find a 99.9% confidence interval for the population mean of total calcium in this patient’s blood. (in mg/dl; round your answer to two decimal places.)lower limit mg/dlupper limit mg/dl (c) Based on your results in part (b), do you think this patient still has a calcium deficiency? Explain.

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