Answered: For each of the following scenarios,…

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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For each of the following scenarios, select the test (from the choices below), that is most appropriate for analyzing the data.

a) Z-test
b) One-sample t-test
c) Independent t-test
d) Dependent t-test
e) 1-Way ANOVA
f) Regression/Correlation
g) Chi-Square

1. A psychologist wants to know if children with a schizophrenic parent are less well-adjusted than the general population, so she gives 20 children of schizophrenics a measure of psychological adjustment which has a mean of 35 in the general population.

2. A researcher wants to know if 5-yr-old boys and girls differ in their social skills. He recruits 30 brother and sister pairs and administers a social skills inventory with scores that can range from 0 to 80.

3. A sample of 60 children are asked to choose their favorite toy among 3 options (stuffed bear, stuffed dog, stuffed cat). Do children prefer these 3 toys equally?

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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