25.30 Can you hear these words? To test whether a hearing aid is right for a pat

Question

25.30 Can you hear these words?

To test whether a hearing aid is right for a patient, audiologists play a tape on whihc words are pronounced at low volume. The patient tries to repeat the words. There are several different lists of words that are supposed to be equally difficult. Are the lists equally difficult when there is background noise? To find out, an experimenter had subjects with normal hearing listen to four lists with a noisy background. The response variable was the percent of the 50 words in a list that the subject repeated correctly. The data set contains 96 responses.14 Here are two study designs that could produce these data:

Design A. The experimenter assigns 96 subjects to 4 groups at random. Each group of 24 subjects listens to one of the lists. All individuals listen and respond separately.

Design B. The experimenter has 24 subjects. Each subject listens to all four lists in random order. All indi- viduals listen and respond separately.

Does Design A allow use of one-way ANOVA to compare the lists? Does Design B allow use of one-way ANOVA to compare the lists? Briefly explain your answers.

Explanation / Answer

The data set contains 96 responses.14 Here are two study designs that could produce these data:

Design A. The experimenter assigns 96 subjects to 4 groups at random. Each group of 24 subjects listens to one of the lists. All individuals listen and respond separately.

Here this is the problem of one way anova.

Because 96 subjects to 4 groups at random. Each group contains 24 subjects. And each respond at 4 levels.

So we use one way anova.

Design B. The experimenter has 24 subjects. Each subject listens to all four lists in random order. All indi- viduals listen and respond separately.

Here we can't use one way anova.

Because there are 24 subjects. Each 24 subjects listen all four lists (say 1,2,3,4) in random order and again it respond separately so there are two factors so we don't use here one way anova.

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