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Blood phosphorus level in dialysis patients. Patients with
Chapter , Problem 6.129(choose chapter or problem)
Blood phosphorus level in dialysis patients.
Patients with chronic kidney failure may be treated by dialysis, in which a machine removes toxic wastes from the blood, a function normally performed by the kidneys. Kidney failure and dialysis can cause other changes, such as retention of phosphorus, that must be corrected by changes in diet. A study of the nutrition of dialysis patients measured the level of phosphorus in the blood of several patients on six occasions. Here is the data for one patient (in milligrams of phosphorus per decilitre of blood):
5.4 5.2 4.5 4.9 5.7 6.3
The measurements are separated in time and can be considered an SRS of the patients’ blood phosphorus level. Assume that this level varies Normally with 𝜎 = 0.9 mg/dl.
(a) Give a 95% confidence interval for the mean blood phosphorus level.
(b) The normal range of phosphorus in the blood is considered to be 2.6 to 4.8 mg/dl. Is there strong evidence that this patient has a mean phosphorus level that exceeds 4.8?
Questions & Answers
QUESTION:
Blood phosphorus level in dialysis patients.
Patients with chronic kidney failure may be treated by dialysis, in which a machine removes toxic wastes from the blood, a function normally performed by the kidneys. Kidney failure and dialysis can cause other changes, such as retention of phosphorus, that must be corrected by changes in diet. A study of the nutrition of dialysis patients measured the level of phosphorus in the blood of several patients on six occasions. Here is the data for one patient (in milligrams of phosphorus per decilitre of blood):
5.4 5.2 4.5 4.9 5.7 6.3
The measurements are separated in time and can be considered an SRS of the patients’ blood phosphorus level. Assume that this level varies Normally with 𝜎 = 0.9 mg/dl.
(a) Give a 95% confidence interval for the mean blood phosphorus level.
(b) The normal range of phosphorus in the blood is considered to be 2.6 to 4.8 mg/dl. Is there strong evidence that this patient has a mean phosphorus level that exceeds 4.8?
ANSWER:Step 1 of 4
Given: The measurements of the level of phosphorus in the blood of one patient on six occasions is provided as,
5.4, 5.2, 4.5, 4.9, 5.7, 6.3
The sample number of occasions is 
The population standard deviation is 