Essay
The manufacturer of a new chewing gum claims that at least eight out of ten dentists surveyed prefer their type of gum and recommend it for their patients who chew gum.An independent consumer research firm decides to test their claim.The findings in a sample of 400 doctors indicate that 76% do actually prefer their gum.Is this evidence sufficient to doubt the manufacturer's claim? Use α = 0.05.
Correct Answer:
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H0 : P = 0.80 against H1: P < 0.80
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