## [answered] 1. A medical researcher claims that less than 20% of Americ

1. A medical researcher claims that less than 20% of American adults are allergic to a medication. In a random sample of 100 adults, 15% say they have such an allergy. Test the researcher?s claim at on = 0.01. 2. Suppose we would like to determine if the typical amount spent per customer for dinner at a new restaurant in town is more than \$20.00. A sample of 49 customers over a three-week period was randomly selected and the average amount spent was \$22.60. Assume that the standard deviation 6 is known to be \$5.50. Using a 0.05 level of significance, would we conclude the typical amount spent per customer is more than \$20.00? 3. The scores on an aptitude test required for entry into a certain job position have a mean at most 500. If a random sample of 36 applicants have a mean of 546 and a standard deviation of 120, is there evidence that their mean score is different from the mean that is expected from all applicants?. Use a 0.05 level of significance.
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