The U.S. Bureau of Labor Statistics reports that 10.2% of U.S. workers belonged to unions in 2018. Suppose a sample of 400 U.S. workers is collected in 2019 to determine whether union efforts to organize have increased union membership.
a. Formulate the hypotheses that can be used to determine whether union membership increased in 2019.
b. If the sample results show that 48 of the workers belonged to unions, what is the p-value for your hypothesis test?
c. At a = .05, what is your conclusion?