Answered: 2 4 List Hearing (% of words)

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

Hearing A researcher investigated four different word
lists for use in hearing assessment. She wanted to know
whether the lists were equally difficult to understand in
the presence of a noisy background. To find out, she

tested 96 subjects with normal hearing randomly assign-
ing 24 to each of the four word lists and measured the

number of words perceived correctly in the presence of
background noise. Here are the boxplots of the four lists:

ANOVA Table

Source DF
Sum of
Squares
Mean
Square F-Ratio P-Value
List 3 920.4583 306.819 4.9192 0.0033
Error 92 5738.1667 62.371
Total 95 6658.6250a) What are the null and alternative hypotheses?
b) What do you conclude?
c) Would it be appropriate to run a multiple comparisons
test (for example, a Bonferroni test) to see which
lists differ from each other in terms of mean percent
correct? Explain.

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