Answered: A researcher wants to know if there are…

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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A researcher wants to know if there are differences in aggressive behavior between 5^th graders, 6^th graders, and 7^th graders. Which of the following would the researcher most likely rely on?

a. Repeated-measures t-test

b. Analysis of variance

c. Correlation

d. None of the above

A researcher wants to know if exercise reduces anxiety in older people. She recruits a sample of elderly individuals and measures their anxiety using Smith’s Anxiety Scale (2012). Next, she has each individual engage in modest exercise for 20 minutes. Finally, she measures their anxiety once more. Which of the following would the researcher most likely be using?

a. Repeated-measures t-test

b. Analysis of variance

c. Chi-square test for goodness of fit

d. Correlation

e. None of the above

If calculated by hand, which of the following statistical analyses involves using one or more mean value?

a. Repeated-measures t-test

b. Analysis of variance

c. Correlation

d. All of the above

e. None of the above

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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