A researcher investigated four different word lists for use in hearing assessments. 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. She randomly assigned 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 summary statistics for number of words perceived correctly for each of the four words lists. Sample size Sample mean Sample standard deviation Word List A 24 32.5 5.1 Word List B 24 34.0 7.1 Word List C 24 25.75 6.3 Word List D 24 26.25 6.7 Suppose an F-test is to be performed. Which of the following is the correct null hypothesis?

A researcher investigated four different word lists for use in hearing assessments. 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. She randomly assigned 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 summary statistics for number of words perceived correctly for each of the four words lists. Sample size Sample mean Sample standard deviation Word List A 24 32.5 5.1 Word List B 24 34.0 7.1 Word List C 24 25.75 6.3 Word List D 24 26.25 6.7 Suppose an F-test is to be performed. Which of the following is the correct null hypothesis?

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter10: Statistics

Section10.3: Measures Of Spread

Problem 1GP

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