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/dI). Assume that the population of x values has an approximately normal distribution. 9.90 9.60 10.30 9.10 9.40 9.80 10.00 9.90 11.20 12.10 LO USE SALT (a) Use a calculator with mean and sample standard deviation keys to find the sample mean reading x and the sample standard deviation s. (Round your answers to four decimal places.) x = 10.13 mg/al s = 0.892 mg/d (b) Find a 99.9% confidence interval for the population mean of total calcium in this patient's blood. (Round your answer to two decimal places.) lower limit mg/dl upper limit mg/dl (c) Based on your results in part (b), do you think this patient still has a calcium deficiency? Explain. O Yes. This confidence interval suggests that the patient may still have a calcium deficiency. Yes. This confidence interval suggests that the patient no longer has a calcium deficiency. O No. This confidence interval suggests that the patient may still have a calcium deficiency. O No. This confidence interval suggests that the patient no longer has a calcium deficiency. Need Help? Read It Master It 7. [2.62/4.76 Points] DETAILS PREVIOUS ANSWERS BBUNDERSTAT12 7.2.013.FB.S. MY NOTES PRACTICE ANOT The method of tree-ring dating gave the following years A.D. for an archaeological excavation site. Assume that the population of x values has an approximately normal distribution. 1,187 1,194 1,299 1,257 1,268 1,316 1,275 1,317 1,275 LA USE SALT (a) Use a calculator with mean and standard deviation keys to find the sample mean year x and sample standard deviation s. (Round your answers to four decimal places.) x = 1265.3333 A.D S = 47.2467 (b) Find a 90% confidence interval for the mean of all tree-ring dates from this archaeological site. (Round your answers to the nearest whole number.) lower limit A.D upper limit A.D. Need Help? Read it Watch It