Compute a 95% CI for the mean white blood countfollowing admission. Pulmonary DiseaseThe data in Table 6.10 concern the mean triceps skin-foldthickness in a group of normal men and a group of men withchronic airflow limitation [5].TABLE 6.10 Triceps skin-fold thickness in normalmen and men with chronic airflowlimitationGroupMeansdnNormal1.350.540Chronic airflow limitation0.920.432

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MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

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Compute a 95% CI for the mean white blood count
following admission.

Pulmonary Disease
The data in Table 6.10 concern the mean triceps skin-fold
thickness in a group of normal men and a group of men with
chronic airflow limitation [5].
TABLE 6.10 Triceps skin-fold thickness in normal
men and men with chronic airflow
limitation
Group
Mean
sd
n
Normal
1.35
0.5
40
Chronic airflow limitation
0.92
0.4
32

Definition Definition Measure of central tendency that is the average of a given data set. The mean value is evaluated as the quotient of the sum of all observations by the sample size. The mean, in contrast to a median, is affected by extreme values. Very large or very small values can distract the mean from the center of the data. Arithmetic mean: The most common type of mean is the arithmetic mean. It is evaluated using the formula: μ = 1 N ∑ i = 1 N x i Other types of means are the geometric mean, logarithmic mean, and harmonic mean. Geometric mean: The nth root of the product of n observations from a data set is defined as the geometric mean of the set: G = x 1 x 2 ... x n n Logarithmic mean: The difference of the natural logarithms of the two numbers, divided by the difference between the numbers is the logarithmic mean of the two numbers. The logarithmic mean is used particularly in heat transfer and mass transfer. ln x 2 − ln x 1 x 2 − x 1 Harmonic mean: The inverse of the arithmetic mean of the inverses of all the numbers in a data set is the harmonic mean of the data. 1 1 x 1 + 1 x 2 + ...

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