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Description: Researchers conducted a study to investigate whether there is a difference in mean PEAK EXPIRATORY FLOW in kids with asthma as compared to those without. Data on PEAK EXPIRATORY FLOW were collected from 100 kids with asthma and 100 kids without chron

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Researchers conducted a study to investigate whether there is a difference in mean PEAK EXPIRATORY FLOW in kids with asthma as compared to those without. Data on PEAK EXPIRATORY FLOW were collected from 100 kids with asthma and 100 kids without chronic bronchitis. The mean PEAK EXPIRATORY FLOW for kids with asthma was 290 with a standard deviation of 64, while the mean PEAK EXPIRATORY FLOW for kids without asthma was 308 with a standard deviation of 77. Based on the data, is there statistical evidence of a lower mean PEAK EXPIRATORY FLOW in kids with asthma as compared to those without? Run the appropriate test at α=0.05. Equal variances. Appropriate Test? Decision Rule? Calculation of test statistic?

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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