A ferritin test is a popular test to measure a person's current iron stores. In women, ferritin is approximately normally distributed with a mean of 89 ng/mL and a standard deviation of 23 ng/mL. If 50 women are tested, what is the probability that the mean ferritin exceeds 90?
Added by Alex T.
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Step 1: Calculate the standard error of the mean (SEM) using the formula SEM = σ / √n, where σ is the standard deviation (23 ng/mL) and n is the sample size (50 women). Show more…
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A ferritin test is a popular test to measure a person's current iron stores. In women, ferritin is approximately normally distributed with a mean of 89 ng/mL and a standard deviation of 23 ng/mL. What is the probability that a woman has a ferritin value of 100 or less? If a woman has a ferritin of 140, what percentile is this? If 50 women are tested, what is the probability that the mean ferritin exceeds 90?
Pritesh R.
Hemoglobin in Women Hemoglobin levels in adult females are normally distributed with a mean of 13.0 g/dL and a standard deviation of 1.3 g/dL (based on data from the National Health and Nutrition Examination Survey). The normal hemoglobin range for women is 12.1 g/dL to 15.1 g/dL. What percentage of women have hemoglobin levels in the normal range? If we randomly collect samples of women with 9 in each sample, what percentage of those samples have a mean hemoglobin level that is within the normal range?
Dominador T.
Let $x=$ red blood cell (RBC) count in millions per cubic millimeter of whole blood. For healthy females, $x$ has an approximately normal distribution with mean $\mu=4.8$ and standard deviation $\sigma=0.3$ (based on information from Diagnostic Tests with Nursing Implications, edited by S. Loeb, Springhouse Press). Convert each of the following $x$ intervals to $z$ intervals. (g) Interpretation If a female had an $\mathrm{RBC}$ count of 5.9 or higher, would that be considered unusually high? Explain using $z$ values and Figure $7-12$.
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