Question
In a television commercial, a manufacturer of toothpaste claims that 75% of dentists recommend the use of its product. A consumer protection group questions this
In a television commercial, a manufacturer of toothpaste claims that 75% of dentists
recommend the use of its product. A consumer protection group questions this claim. A random sample of 300 dentists yields a result of 210 recommending that toothpaste.
A. Compute the 99% confidence interval for the population proportion of dentists who recommend the use of this toothpaste. Interpret this interval.
B. How many dentists should be sampled in order to be 99% confident of being within 3% of
the population proportion of dentists recommending this toothpaste?
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Statistical Inference
Authors: George Casella, Roger L. Berger
2nd edition
0534243126, 978-0534243128
