A study found that, in 2005, 12.5% of U.S. workers belonged to the unions (The Wall Street Journal, January 21, 2006). Assume a sample of 380 U.S. workers is gathered in 2006 to find out whether union efforts to organize have raised union membership.
Formulate the hypotheses which can be used to determine whether union membership increased in 2006.
H0: p
Ha: p
If the sample results show that the 52 of workers belonged to unions, what is the sample proportion of workers belonging to unions (to 2 decimals)?
Complete the following, assuming an a level of .05.
Compute the value of the test statistic (to 2 decimals).
What is the p-value (to 4 decimals)?
What is your conclusion?