Answered: A researcher is attempting to determine…

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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Question

A researcher is attempting to determine whether a novel drug affects the length of cilia growing in the lumen of the gut of rats. All groups have 30 individuals, with group A being exposed to a sugar pill, group B a low dose and group c high dose. The researcher in a hurry only calculates the sum of squares and degrees of freedom for the model and residuals, starting the following anova table.

a)To 2 decimal places, what is the mean squares of the treatment?

b)To 2 decimal places what is the mean squares for the residual error?

c)What is the effect size (eta-squared, also known as the r-squared) of this treatment, to two decimal places?

Df
2
Sum Sq
2.96
25.33
Mean Sq
F value
Pr(-F)
treatment
Residuals
87

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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