Teen drinking A study of the health behavior of school-aged children asked a sample of 15-year-olds in several different countries if they had been drunk at least twice.The results are shown in the table, by gender. Give a 95%confidence interval for the difference in the rates for malesand females. Be sure to check the assumptions that supportyour chosen procedure, and explain what your intervalmeans. (Health and Health Behavior Among YoungPeople. Copenhagen: World Health Organization, 2000) Percent of 15-Year-OldsDrunk at Least TwiceCountry Female MaleDenmark 63 71Wales 63 72Greenland 59 58England 62 51Finland 58 52Scotland 56 53No. Ireland 44 53Slovakia 31 49Austria 36 49Canada 42 42Sweden 40 40Norway 41 37Ireland 29 42Germany 31 36Latvia 23 47Estonia 23 44Hungary 22 43Poland 21 39USA 29 34Czech Rep. 22 36Belgium 22 36Russia 25 32Lithuania 20 32France 20 29Greece 21 24Switzerland 16 25Israel 10 18

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2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.