8th Edition

ISBN: 9781305268920

Author: Bernard Rosner

Publisher: Cengage Learning

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Chapter 8, Problem 89P

A study compared mean electroretinogram (ERG) amplitude of patients with different genetic types of retinitis pigmentosa (RP), a genetic eye disease that often results in blindness. The results shown in Table 8.24 were obtained for ln (ERG amplitude) among patients 18–29 years of age.

Table 8.24 Comparison of mean ln (ERG amplitude) by genetic type among patients with RP

Chapter 8, Problem 89P, A study compared mean electroretinogram (ERG) amplitude of patients with different genetic types of

What is the standard error of ln(ERG amplitude) among patients with dominant RP? How does it differ from the standard deviation in the table?

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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Chapter 8, Problem 88P

Chapter 8, Problem 90P

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Chapter 8 Solutions

Fundamentals of Biostatistics

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Solution Summary: The author explains that the standard error of In(ERG amplitude) among patients with dominant RP is 0.023. The standard deviation is 0.18.

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