Two types of medication for hives are being tested to determine if there is a difference in the proportions of adult patient reactions. Twenty out of a random sample of 200 adults given medication A still had hives 30 minutes after taking the medication. Twelve out of another random sample of 200 adults given medication B still had hives 30 minutes after taking the medication. Sample1: medication A, Sample2: medicationB (a) Find the 99% confidence interval for the difference in the proportions
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given information:
let us consider x : samples of medication for hives of adult patient reactions
level of significance= 0.01
z critical value at 0.01 level of significance=2.576
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