A study found that, in 2005, 12.5% of U.S. workers belonged to unions (The Wall Street Journal, January 21, 2006). Suppose a sample of 400 U.S. workers is collected in 2006 to determine whether union efforts to organize have increased union membership.

1. Formulate the hypotheses that can be used to determine whether union membership increased in 2006.
3. H0: p Select
4. greater than .125
5. greater than or equal to .125
6. equal to .125
7. less than or equal to .125
8. less than .125
9. not equal to .125
10. Item 1
12. Ha: p Select
13. greater than .125
14. greater than or equal to .125
15. equal to .125
16. less than or equal to .125
17. less than .125
18. not equal to .125
19. Item 2
22. If the sample results show that 52 of the workers belonged to unions, what is the sample proportion of workers belonging to unions (to 2 decimals)?
25. Complete the following, assuming an level of .05.
27. Compute the value of the test statistic (to 2 decimals).
30. What is the p-value (to 4 decimals)?