a talker's voice on speech comprehension, an audiologist recruits twenty volunteer participants. The participants are asked to listen to spoken sentences embedded in background noise and report the words in these sentences. Half of the sentences are spoken by their partner's voice (familiar-voice condition), while the other half are spoken by a stranger's voice (unfamiliar-voice condition). On average, participants correctly reported 3.3 words (SD = 2.2) from the sentences spoken by an unfamiliar voice and 4.2 words (SD = 2.5) from the sentences spoken by a familiar voice. The average difference between the two conditions is 1.25 words, and the standard deviation of the differences
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To investigate the effect of familiarity with a talker's voice on speech comprehension, an audiologist recruits twenty volunteer participants. The participants are asked to listen to spoken sentences embedded in background noise and report the words in these sentences. Half of the sentences are spoken by their partner's voice (familiar-voice condition), while the other half are spoken by a stranger's voice (unfamiliar-voice condition). On average, participants correctly reported 3.3 words (SD = 2.2) from the sentences spoken by an unfamiliar voice and 4.2 words (SD = 2.5) from the sentences spoken by a familiar voice. The average difference between the two conditions is 1.25 words, and the standard deviation of the differences is 2.65 words. The audiologist wants to determine whether there is a significant familiarity benefit (i.e., better speech comprehension for familiar compared to unfamiliar talkers) at an alpha level of .05.
a) Conduct the appropriate statistical test to answer the audiologist's research question.
b) Computer r^2 as an effect size for the familiarity benefit and interpret the obtained value. For the interpretation, it is not sufficient to state whether this is large, medium, or small effect.
c) In a related research article, you read the following text:
"We found a significant effect of voice familiarity on speech comprehension with better word recognition for familiar (M = 9.11, SD = 3.10) compared to unfamiliar voices (M = 7.56, SD = 2.30): t(8) = 2.58, p = .033, d = 0.859."
Calculate the 95% confidence interval for this example.
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