A sample of 1200 adults revealed that 115 of them are left-handed. Test the claim with a significance level of 0.05 that 15% of all adults are left-handed. a) identify the claim, the null hypothesis, and the alternative hypothesis? b) Which type of test will be used? c) What critical values are there? d) What is the value of the test statistic? e) What is the decision? f) What is the conclusion?

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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.