A medical researcher says that 20 of US adults are smokers I

A medical researcher says that 20% of U.S. adults are smokers. In a random sample of 200 adults, 37 say they are smokers. At alpha= .01, is there enough evidence to reject the researcher

Solution

The situation is based on U.S adults who are smokers. In this case, the event of success is that proportion of smokers. Here, the study is carried out to investigate the claim that whether the proportion of smokers is 0.20 or not. The following steps are required is to clarify the claim.

Step 1: Construction of null and alternative hypotheses

Null hypothesis (H₀) : The null hypothesis states that, researcher