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The manufacturer of a new toothbrush claims that more than 80% of dentists surveyed prefer their type of toothbrush and recommend it for their patients.
The manufacturer of a new toothbrush claims that more than 80% of dentists surveyed prefer their type of toothbrush and recommend it for their patients. An independent consumer research firm decides to test their claim. The findings in a sample of 200 dentists indicate that 74.1% of the respondents do actually prefer their toothbrush. Can we conclude at the 5% significance level that the manufacturer is correct
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