Concept explainers
Toothpaste brands with the ADA seal. Consumer Reports evaluated and rated 46 brands of toothpaste. One attribute examined in the study was whether or not a toothpaste brand carries an American Dental Association (ADA) seal verifying effective decay prevention. The data for the 46 brands (coded 1 = ADA seal, 0 =no ADA ADA seal) are listed here.
- a. Give the null and alternative hypotheses for testing whether the true proportion of toothpaste brands with the ADA seal verifying effective decay prevention is less than .5.
- b. Locate the p-value on the Minitab printout below.
- c. Make the appropriate conclusion using α = .10.
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